Finding more than one lump in your breast can understandably cause concern. However, having multiple breast cysts does not necessarily mean that something serious is wrong. Breast cysts are fluid-filled sacs that are usually benign, and you may develop several cysts in one breast or in both breasts.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Multiple cysts can occur as part of normal hormonal changes, particularly during the reproductive years. Some cysts are small enough to be seen only on imaging, while others may be large enough to feel as distinct lumps. The appropriate approach depends on their appearance, size, symptoms and whether they change over time.
If you have been diagnosed with multiple breast cysts, understanding why they occur and when they need treatment can help you know what to expect. For an overview of diagnosis and treatment approaches, see Breast Cyst Treatment.
Why Do Multiple Breast Cysts Develop?
The exact cause of breast cysts is not always known. Hormonal changes are thought to play an important role. Breast tissue responds to changes in hormones during the menstrual cycle, and these changes can contribute to fluid accumulation within breast glands or ducts.
Some cysts develop when ducts or glands within the breast become blocked or stretched, allowing fluid to collect. This can result in one cyst or several cysts developing at the same time.
Multiple cysts are also commonly associated with fibrocystic breast changes. In this situation, you may notice several areas of lumpiness, breast fullness or tenderness, particularly around your menstrual period.
Can You Have Cysts in Both Breasts?
Yes. Breast cysts can occur in one breast or both breasts. Some people may have several cysts concentrated in one area, while others may have cysts distributed throughout the breast tissue.
The presence of multiple cysts by itself does not indicate breast cancer. What matters is how the cysts appear on examination and imaging and whether there are any features that require further investigation.
What Do Multiple Breast Cysts Feel Like?
Breast cysts can feel different depending on their size and location. A cyst may feel:
- Round or oval
- Smooth and well-defined
- Soft or firm
- Mobile when pressed
- Tender, particularly before menstruation
When several cysts are present, the breast may feel generally lumpy or uneven rather than having one clearly defined lump. Some very small cysts cannot be felt at all and may only be detected during an ultrasound or mammogram.
How Are Multiple Breast Cysts Diagnosed?
If you notice several breast lumps, your healthcare professional may begin with a clinical breast examination and ask about your symptoms, menstrual cycle and previous breast problems.
Breast ultrasound
Ultrasound is particularly useful for determining whether a lump is filled with fluid or is solid. This helps distinguish a typical simple cyst from other types of breast lesions that may require additional assessment.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Mammography
A mammogram may also be recommended depending on your age, symptoms and breast findings. Larger cysts and clusters of smaller cysts can often be seen on mammography, although very small cysts may not be visible.
Fine-needle aspiration
If a cyst is large, painful or causing significant discomfort, a thin needle may be used to withdraw its fluid. Ultrasound may be used to guide the needle to the appropriate area.
If typical fluid is removed and the lump disappears, this can help confirm that it is a cyst. However, bloody fluid, a persistent lump or the inability to obtain fluid may require additional testing.
Do Multiple Breast Cysts Always Need Treatment?
No. Treatment is not usually necessary simply because you have several cysts. Simple cysts that do not cause symptoms can often be monitored. Many may disappear on their own or change in size over time.
Treatment becomes more relevant when cysts cause pain, pressure, significant discomfort or other concerning findings. Your healthcare professional may recommend follow-up imaging if a cyst needs to be monitored or if its appearance does not clearly indicate a simple cyst.
Treatment Options for Multiple Breast Cysts
The treatment approach is usually based on the cyst causing the most symptoms or on any cyst that has an unusual appearance.
1. Observation and follow-up
If the cysts are simple and do not cause significant symptoms, observation may be all that is needed. You may be advised to monitor for changes in size, pain or other breast symptoms.
2. Fine-needle aspiration
Aspiration can be used to drain a painful or large cyst. Removing the fluid can collapse the cyst and often relieves pressure or discomfort.
However, drainage does not necessarily prevent the cyst from returning. A cyst may refill with fluid, and new cysts can also develop elsewhere in the breast.
3. Symptom management
Mild breast discomfort may sometimes be managed with supportive measures such as wearing a well-fitting supportive bra and using warm or cold packs.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Over-the-counter pain medicines may also be appropriate for some people, depending on their overall health and other medicines they take.
If breast pain is severe or repeatedly linked to hormonal changes, your healthcare professional may discuss additional treatment options.
4. Biopsy when findings are concerning
Not every breast lump that appears alongside multiple cysts is necessarily a cyst. If imaging shows a solid component, an indeterminate lesion or another feature that requires clarification, a biopsy may be recommended.
A biopsy involves taking a sample of tissue for laboratory examination. This is different from aspiration, which removes fluid from a cyst.
5. Surgery in selected cases
Surgical removal of a breast cyst is uncommon. It may be considered when a cyst repeatedly returns and causes significant symptoms, remains persistent despite other management, or has features that require removal or further evaluation.
What If the Cysts Keep Coming Back?
Recurrence does not necessarily mean that the cyst has become dangerous. Breast cysts can disappear and return, and new cysts may develop over time, particularly when hormonal changes continue to influence breast tissue.
However, a lump that persists, becomes larger or changes in character should be reassessed rather than automatically assumed to be the same cyst as before.
The Bottom Line
Multiple breast cysts are relatively common and are usually benign. Hormonal changes can contribute to their development, and cysts may occur in one or both breasts. If they are simple and symptom-free, treatment may not be necessary.
When cysts are painful or large, fine-needle aspiration can provide relief by draining the fluid. If a lump has unusual features, remains after aspiration or cannot be confirmed as a simple cyst, further imaging or biopsy may be needed. Surgery is generally reserved for selected recurrent, persistent or concerning cysts.
Most importantly, a new or changing breast lump should be evaluated even if you have previously had breast cysts. Proper assessment helps distinguish harmless cysts from other breast conditions and ensures that any finding requiring further attention is not overlooked.
