Hyperparathyroidism

Introduction

If you have recently been told you have hyperparathyroidism, or your blood tests have shown a high calcium level that your doctor is investigating, you are probably trying to understand what is happening inside your body and what comes next. The condition involves four small glands in your neck that most people have never heard of until something goes wrong with them. The good news is that hyperparathyroidism is well understood, and for most people, there are clear paths forward.

This guide explains what hyperparathyroidism is, the different types and what causes them, how it is diagnosed, the treatment options doctors consider, what parathyroid surgery involves, and what life looks like afterwards. It is written for adults who have been diagnosed or are being investigated for the condition, and for parents of children with hyperparathyroidism, which is rare but does occur. Wherever possible, plain language is used and clinical terms are defined the first time they appear.

What Is Hyperparathyroidism?

Hyperparathyroidism is a condition in which one or more of the parathyroid glands produce too much parathyroid hormone, usually shortened to PTH. PTH controls the level of calcium in the blood. When there is too much PTH, blood calcium tends to rise above the normal range, a state called hypercalcaemia.

The Parathyroid Glands

• It pulls calcium out of bones into the bloodstream.
• It tells the kidneys to hold on to more calcium rather than losing it in urine.
• It helps activate vitamin D, which in turn helps the gut absorb more calcium from food.

When blood calcium rises, healthy parathyroid glands quiet down. In hyperparathyroidism, this feedback system breaks down. The glands continue to release PTH even when blood calcium is already high, or they release excess PTH in response to a long-standing calcium problem elsewhere in the body.

Why It Matters

Sustained high PTH and high calcium affect more than just numbers on a lab report. Over time, they can weaken bones, contribute to kidney stones, strain the kidneys, and cause symptoms in the muscles, gut, heart, and mind. This is why doctors take the condition seriously even when symptoms feel mild.

Types of Hyperparathyroidism

Primary Hyperparathyroidism

This is the most common form. One or more parathyroid glands become overactive on their own and produce too much PTH regardless of blood calcium levels. In about 80 to 85 percent of cases, a single benign (non-cancerous) growth on one gland, called a parathyroid adenoma, is responsible. Less commonly, multiple glands become enlarged (a condition called hyperplasia), and in a very small number of cases, parathyroid cancer is found.

Primary hyperparathyroidism is often picked up when a routine blood test shows a high calcium level, sometimes years before symptoms become obvious.

Secondary Hyperparathyroidism

In this form, the parathyroid glands are responding appropriately to a problem elsewhere — usually a long-standing low calcium level or vitamin D deficiency. Common causes include:

• Chronic kidney disease, where the kidneys can no longer activate vitamin D properly and tend to lose calcium
• Severe vitamin D deficiency
• Conditions that interfere with absorbing nutrients from the gut, such as coeliac disease or after some types of weight-loss surgery

In secondary hyperparathyroidism, calcium levels in the blood are usually normal or low, but PTH is high because the glands are working overtime to keep calcium up.

Tertiary Hyperparathyroidism

This develops after long-standing secondary hyperparathyroidism, most often in people with advanced chronic kidney disease or after a kidney transplant. The parathyroid glands, after being stimulated for years, no longer switch off even when the original problem is treated. They keep releasing PTH on their own, and blood calcium can climb. Tertiary hyperparathyroidism often needs surgical treatment.

Causes and Risk Factors

The causes of hyperparathyroidism depend on the type.

Causes of Primary Hyperparathyroidism

• Parathyroid adenoma: a small, benign growth on one of the four glands. This is by far the most common cause.
• Parathyroid hyperplasia: enlargement of all four glands. This is seen more often in inherited forms of the condition.
• Parathyroid carcinoma: a cancer of a parathyroid gland. This is rare.
• Inherited syndromes: a small number of cases are linked to genetic conditions such as Multiple Endocrine Neoplasia (MEN) types 1, 2A and 4, or familial hypocalciuric hypercalcaemia.

Causes of Secondary and Tertiary Hyperparathyroidism

• Chronic kidney disease (the most important cause)
• Severe and prolonged vitamin D deficiency
• Long-standing low dietary calcium intake
• Malabsorption from conditions such as coeliac disease, inflammatory bowel disease, or after bariatric surgery
• Long-term use of some medications, such as lithium or certain diuretics

Who Is More Likely to Develop It

• Women, especially after menopause, are more commonly affected by primary hyperparathyroidism than men
• People over the age of 50
• People with a family history of parathyroid or other endocrine disorders
• People with chronic kidney disease
• People who have had radiation exposure to the neck

Having one or more risk factors does not mean the condition will develop, but it can help doctors decide when to test calcium and PTH levels.

Signs and Symptoms

Hyperparathyroidism has been called a “silent disease” because symptoms can be vague, slow to develop, or absent altogether. Many people are diagnosed only after a routine blood test shows a raised calcium level. If you have already been diagnosed, you may recognise some of these patterns in your own experience.

Common Symptoms

• Tiredness or low energy that does not improve with rest
• Aches in the bones and joints
• Muscle weakness, especially in the thighs and upper arms
• Increased thirst and passing larger amounts of urine
• Constipation or general digestive discomfort
• Loss of appetite and nausea
• Difficulty concentrating or a feeling of “brain fog”
• Low mood, anxiety, or irritability

Signs of More Advanced Disease

When hyperparathyroidism has been present for a longer time, or when calcium levels are higher, additional problems can appear:

• Kidney stones, sometimes with sudden severe pain in the back or side
• Osteoporosis or low bone density, which raises the risk of fractures
• Fractures from minor falls or even ordinary activities
• Vomiting, severe abdominal pain, or pancreatitis
• Increased risk of high blood pressure or heart rhythm problems

A classic description of severe disease uses the phrase “stones, bones, abdominal groans and psychic moans” — covering kidney stones, bone pain, gut symptoms, and mood or thinking changes. Most modern cases are picked up far earlier than this, when symptoms are mild or absent.

Diagnosis

Diagnosis happens in two stages. First, doctors confirm that PTH is inappropriately high for the calcium level. Second, if surgery is being considered, they try to locate which gland or glands are responsible.

Blood and Urine Tests

The main blood tests include:

• Serum calcium — usually raised in primary and tertiary hyperparathyroidism; often normal or low in secondary hyperparathyroidism
• Parathyroid hormone (PTH) — raised, or inappropriately normal when calcium is high
• Vitamin D (25-hydroxyvitamin D) — often low; deficiency must be identified and corrected
• Kidney function tests — including creatinine and eGFR
• Phosphate — often low in primary disease, high in kidney-related disease
• 24-hour urine calcium — helps distinguish primary hyperparathyroidism from a similar-looking inherited condition called familial hypocalciuric hypercalcaemia

Bone and Kidney Assessment

Because bones and kidneys are the organs most affected, doctors usually assess them at diagnosis:

• DEXA bone density scan to check for osteoporosis, looking at the spine, hip, and forearm
• Kidney imaging, often an ultrasound or low-dose CT scan, to check for kidney stones

Imaging to Locate the Overactive Gland

When surgery is planned, imaging helps the surgeon find the abnormal gland or glands. Imaging does not by itself diagnose hyperparathyroidism — the diagnosis is made by blood tests. Common imaging studies include:

• Neck ultrasound — widely available and often the first step
• Sestamibi scan — a nuclear medicine scan that can light up overactive parathyroid tissue
• 4D CT scan — a detailed CT used when other imaging is unclear
• MRI — reserved for selected situations

If two imaging tests agree on the location of a single abnormal gland, a smaller, more focused operation often becomes possible.

Treatment and Management

Treatment depends on the type of hyperparathyroidism, how severe it is, the impact on bones and kidneys, your age and other health conditions, and your personal preferences. The American Association of Endocrine Surgeons (AAES) and international expert workshops have published guidelines that doctors use to decide between surgery, medication, and active monitoring.

Surgery (Parathyroidectomy)

Surgical removal of the overactive gland or glands, called parathyroidectomy, is the only treatment that can cure primary hyperparathyroidism. For symptomatic primary hyperparathyroidism, surgery is generally the recommended treatment when the patient is fit for it.

For asymptomatic primary hyperparathyroidism, surgery is typically recommended when one or more of the following are present:

• Age under 50
• Blood calcium more than 1 mg/dL (0.25 mmol/L) above the upper limit of normal
• Low bone density on DEXA, or a previous fracture from minor injury
• Kidney function decline, kidney stones, or high calcium in the urine

Even for patients who do not meet these criteria, surgery is one of the options that doctors may discuss, because it is the only definitive cure.

For tertiary hyperparathyroidism, surgery is often needed because the glands have lost their normal feedback control. For secondary hyperparathyroidism, surgery is reserved for selected cases where medical treatment has failed.

Medical Management

Medications may be used when surgery is not appropriate or not yet needed:

• Vitamin D supplementation to correct deficiency, which can in itself bring PTH down, especially in secondary hyperparathyroidism
• Calcimimetics (such as cinacalcet) — medications that make the parathyroid glands more sensitive to calcium, lowering PTH and calcium. These are commonly used in secondary hyperparathyroidism related to kidney disease, in parathyroid cancer, and in selected patients with primary disease who cannot have surgery.
• Bisphosphonates — medications that protect bones and can lower calcium
• Hormone-related treatments in postmenopausal women, where appropriate, to help bone density
• Phosphate binders and active vitamin D analogues in chronic kidney disease, used under the care of a kidney specialist

Medications can control numbers and protect bones but do not cure primary hyperparathyroidism.

Active Monitoring

Some people with mild, asymptomatic primary hyperparathyroidism are followed without immediate treatment. This usually involves:

• Blood calcium and kidney function checks once or twice a year
• A DEXA bone density scan every one to two years
• Kidney imaging if symptoms of stones develop
• Adequate hydration and a normal calcium diet (severe calcium restriction is not advised)

If any of the criteria for surgery later develops, the treatment plan is revisited.

Parathyroid Surgery in Detail

Parathyroidectomy is one of the most common operations performed by endocrine and head-and-neck surgeons. For most people, it is short, well tolerated, and curative.

Types of Parathyroid Surgery

• Minimally invasive (focused) parathyroidectomy: used when imaging clearly shows a single abnormal gland. A small incision is made on one side of the neck, and only the affected gland is removed.
• Bilateral neck exploration: used when more than one gland may be involved, when imaging is unclear, or in inherited disease. All four glands are examined and any that are abnormal are removed.
• Subtotal parathyroidectomy: in patients with disease in all four glands, such as some inherited cases or tertiary hyperparathyroidism, three and a half glands are removed and a small piece of healthy parathyroid tissue is left behind to maintain function.
• Total parathyroidectomy with auto-transplantation: sometimes used in tertiary hyperparathyroidism. All four glands are removed and a small piece of one is transplanted into a muscle, often in the forearm, where it continues to make PTH and can be more easily accessed later if needed.

What Happens on the Day

Most parathyroid surgeries are done under general anaesthesia, although focused operations are sometimes performed under local anaesthesia with sedation. The general sequence is:

1. Final checks and anaesthesia
2. A small incision in the lower front of the neck, often within a natural skin crease
3. Careful identification of the parathyroid gland or glands, avoiding the nearby recurrent laryngeal nerves that control the voice
4. Removal of the abnormal gland or glands
5. Intraoperative PTH testing in many centres: a blood sample is checked during the operation to confirm that PTH has dropped sharply once the diseased gland is removed
6. Closure of the incision with fine stitches or skin glue, leaving a small scar that usually fades over time

Most operations take between 45 minutes and 2 hours.

Preparing for Surgery

Before surgery, your team will usually:

• Confirm the diagnosis and review all imaging
• Correct severe vitamin D deficiency where possible
• Optimise other conditions such as high blood pressure or diabetes
• Review your medications, especially blood thinners
• Arrange a pre-anaesthesia check
• Give clear fasting instructions for the day of surgery

If you smoke, you will be advised to stop in the weeks before surgery to help wound healing.

Recovery After Parathyroid Surgery

Recovery from parathyroidectomy is usually faster than people expect.

Hospital Stay

Many people go home the same day or after a single overnight stay. Calcium levels are checked before discharge, and sometimes the next morning, to make sure they are stable.

First Days at Home

• Mild soreness or stiffness in the neck is normal
• A small amount of bruising or swelling at the incision can occur
• Your voice may feel slightly tired or hoarse for a few days; significant or lasting voice change is uncommon
• Simple pain relief is usually enough
• You can shower as advised by your surgeon and keep the wound clean and dry

Calcium After Surgery

After successful surgery, blood calcium normalises within a day or two. In some patients, calcium can drop temporarily because the remaining parathyroid glands need time to wake up. Symptoms of low calcium include tingling around the lips and fingers and muscle cramps. Many surgical teams prescribe calcium and vitamin D supplements for a few weeks to prevent this.

If you have had severe bone disease for a long time, your bones may absorb calcium rapidly after surgery — sometimes called “hungry bone syndrome.” This may need more intensive calcium replacement for a longer period.

Getting Back to Normal

• Light activities and walking: within a few days
• Return to office or sedentary work: usually within 1 to 2 weeks
• Heavy lifting, vigorous exercise, and contact sports: usually after 2 to 4 weeks, on your surgeon’s advice
• Driving: when you can comfortably turn your neck and are off strong pain medicines

Risks and Complications

Parathyroid surgery is generally safe, particularly when carried out by surgeons who perform it regularly. As with any operation, there are risks to discuss with your surgical team:

• Bleeding or haematoma at the surgical site — uncommon but can rarely require urgent attention
• Wound infection — uncommon
• Temporary low calcium — common in the first days and usually managed with supplements
• Persistent low calcium (hypoparathyroidism) — more likely after surgery on multiple glands; may need long-term treatment
• Hoarseness or voice change from irritation of the recurrent laryngeal nerve — usually temporary; permanent change is rare in experienced hands
• Persistent or recurrent hyperparathyroidism — when not all overactive tissue is removed, or when other glands later become overactive
• Scar formation — the scar usually fades but its appearance varies
• Risks of general anaesthesia

Outcomes are best in centres where parathyroid surgery is performed frequently, where intraoperative PTH testing is available, and where the surgeon has clear training and experience in endocrine procedures.

Lifestyle and Self-Management

Whether you have surgery or are being monitored, several habits support long-term bone, kidney, and overall health.

Calcium and Vitamin D

• Aim for a normal calcium intake from food rather than very high or very low. Severe restriction of dietary calcium is not recommended for primary hyperparathyroidism, as it can actually drive PTH higher.
• Correct vitamin D deficiency under your doctor’s guidance.
• Avoid very large doses of calcium supplements unless prescribed.

Hydration

Drinking enough water helps protect the kidneys and lowers the risk of kidney stones, especially if calcium levels in the urine are high.

Movement and Bones

• Regular weight-bearing exercise such as walking helps maintain bone strength.
• Resistance and balance exercises reduce the risk of falls and fractures.
• Sensible sun exposure helps with vitamin D, as long as skin safety is considered.

Other Healthy Habits

• Limit alcohol
• Avoid smoking, which weakens bones and slows healing
• Keep blood pressure, blood sugar, and cholesterol under control
• Attend follow-up appointments and blood tests as advised

Monitoring and Follow-up

Hyperparathyroidism, whether treated surgically or medically, benefits from structured follow-up.

After Successful Surgery

• Calcium and PTH checks at intervals advised by your team, often at 6 months and 12 months, then yearly
• Repeat DEXA bone density scan after one to two years to confirm bone improvement
• Long-term annual review, even after a successful cure, especially if there was a strong family history or any features of an inherited syndrome

If You Are Being Monitored Without Surgery

• Blood calcium and kidney function once or twice a year
• DEXA scan every one to two years
• Vitamin D level checks
• Reassessment if symptoms change or new problems appear

If You Have Secondary or Tertiary Disease

Follow-up is led by a kidney specialist (nephrologist) along with the surgical team. Monitoring includes PTH, calcium, phosphate, vitamin D, and assessment of bone health, often with regular review of medication doses.

Complications of Untreated or Long-standing Disease

• Osteoporosis and fractures, particularly of the spine, hip and forearm
• Kidney stones and repeated episodes of kidney pain
• Chronic kidney disease or worsening of pre-existing kidney problems
• Peptic ulcers and pancreatitis
• Cardiovascular effects such as high blood pressure and rhythm changes, especially when calcium is markedly raised
• Persistent fatigue, low mood, and cognitive symptoms that affect quality of life
• Hypercalcaemic crisis — a rare but serious state where very high calcium causes confusion, severe weakness, dehydration, and irregular heart rhythm. This needs emergency hospital care.

Many of these complications can be prevented or improved with timely treatment.

Living with Hyperparathyroidism

For most people with primary hyperparathyroidism, surgery brings the condition to a clear end. Symptoms such as tiredness, low mood, brain fog, bone pain, and frequent urination often improve over the weeks and months that follow. Bones gradually rebuild, and the risk of new kidney stones falls.

If you are being monitored rather than operated on, life can continue largely as normal. Routine blood tests, sensible hydration, and protection of bone health become part of regular self-care.

For those with secondary or tertiary hyperparathyroidism, the condition is usually part of a broader picture of kidney disease. Treatment is more long-term, with attention to PTH, calcium, phosphate, vitamin D, diet, dialysis where needed, and sometimes surgery. Living well involves working closely with your nephrology and endocrine teams.

Many people find it helps to:

• Keep a simple record of test results to track trends over time
• Bring a list of current medications to every appointment
• Ask questions about what each test result means for them
• Tell new doctors and dentists about the diagnosis, especially before any operation

Hyperparathyroidism in Children

Hyperparathyroidism is uncommon in children, but when it occurs, it deserves particular attention.

Common Causes in Children

• Neonatal severe hyperparathyroidism — a rare, serious condition appearing in newborns, often linked to genetic changes in calcium-sensing receptors
• Inherited syndromes — including Multiple Endocrine Neoplasia (MEN) type 1 or 2A, hyperparathyroidism-jaw tumour syndrome, and familial isolated hyperparathyroidism
• Secondary hyperparathyroidism from childhood chronic kidney disease, severe vitamin D deficiency (sometimes presenting as rickets), or long-standing malabsorption

How It Shows in Children

• Slow growth or poor weight gain
• Bone pain, deformities, or fractures from minor injury
• Kidney stones
• Tiredness, irritability, or changes in school performance
• Abdominal pain, vomiting, or constipation

Diagnosis and Treatment in Children

Diagnosis follows the same principles as in adults, with blood tests for calcium, PTH, phosphate, vitamin D, and kidney function, and imaging where surgery is planned. Because inherited causes are more common in children than in adults, genetic counselling and family testing are often part of the assessment.

Treatment is best provided by a multidisciplinary team including a paediatric endocrinologist, a paediatric surgeon experienced in neck operations, and where relevant a paediatric nephrologist. Surgery in children, when needed, follows similar principles to adult surgery but is typically performed in centres with paediatric endocrine surgery experience.

Frequently Asked Questions

Is hyperparathyroidism the same as a thyroid problem?

No. Although the parathyroid glands sit behind the thyroid, they have a different function. Parathyroid problems affect calcium and PTH; thyroid problems affect thyroid hormones. The two can sometimes coexist, but they are separate conditions.

Is hyperparathyroidism cancer?

In the very large majority of cases, no. Most primary hyperparathyroidism is caused by a benign adenoma or by hyperplasia. Parathyroid cancer is rare. Your team will look at calcium levels, PTH levels, imaging features, and surgical findings to assess this.

Can hyperparathyroidism be treated without surgery?

For some patients, yes. Mild, asymptomatic primary hyperparathyroidism may be monitored. Secondary hyperparathyroidism is often managed medically alongside treatment of the underlying cause. However, for primary hyperparathyroidism that meets surgical criteria, surgery remains the only definitive cure, and major endocrine surgery societies generally recommend it where appropriate.

Will my symptoms improve after surgery?

Many people notice that tiredness, mood changes, brain fog, and bone aches improve over weeks to months after successful surgery. Bone density usually improves over one to two years. Symptoms that have been present for a long time may take longer to settle, and not every symptom is fully reversed.

Will I need calcium supplements after surgery?

Often, yes, at least for the first few weeks. This protects against temporary low calcium while the remaining glands recover. Your team will guide you on dose and duration, and on when you can stop.

Could it come back?

For most people with a single adenoma, successful surgery is curative and recurrence is uncommon. The risk is higher when multiple glands are involved, in inherited forms, or in tertiary hyperparathyroidism. Long-term follow-up helps catch any recurrence early.

Should my family be tested?

If you have been diagnosed under the age of 40, if more than one gland was abnormal, or if there are other endocrine tumours in the family, your doctor may suggest genetic testing for inherited syndromes. If a syndrome is identified, close relatives can be offered screening.

What should I do if my calcium feels very high again?

Symptoms such as severe weakness, confusion, persistent vomiting, severe thirst, or a noticeably reduced urine output, especially in someone with known hyperparathyroidism, can suggest dangerously high calcium. This needs urgent medical assessment.

Conclusion

Hyperparathyroidism is one of the more common endocrine conditions, and for most people the path through it is well marked. Blood tests confirm the diagnosis, imaging helps locate the problem when surgery is planned, and treatment is matched to the type of hyperparathyroidism and to your overall health. For primary disease, parathyroidectomy offers a clear cure for most patients. For secondary and tertiary disease, careful medical management, sometimes combined with surgery, can protect bones, kidneys, and quality of life.

Whatever the type, the long-term picture is generally good when the condition is recognised and managed in partnership with an experienced team. The next steps — whether that is preparing for surgery, starting medication, or settling into a monitoring schedule — are best worked through in conversation with the doctors leading your care, who can tailor the plan to your test results, your symptoms, and your personal priorities.