Breast Cysts

What it is

A breast cyst is a round or oval sac filled with fluid, like a tiny water balloon inside the breast tissue. They can be too small to feel or grow to be several inches across. It's possible to have one or many cysts in one or both breasts.

How common it is

Cysts are very common, especially for women in their 30s and 40s who have not yet gone through menopause. However, they can happen at any age.

What you may notice

You might feel a smooth, round lump that moves easily under your fingers. Cysts often feel soft, but can also be firm. They may become larger and more tender right before your period and then get smaller afterward.

What can contribute

The exact cause isn't known, but cysts are thought to be related to the normal hormonal shifts that happen during your monthly cycle.

How it is usually checked

Your provider can usually identify a cyst with a breast ultrasound, which uses sound waves to show if a lump is fluid-filled or solid. If a cyst is large or uncomfortable, your provider may suggest draining the fluid with a small needle, which also makes the lump go away.

Does this change my long-term risk?

Simple cysts are benign, which means they are not harmful. Having cysts does not change your long-term breast health risk.

Comfort and everyday care

• Wearing a supportive, well-fitting bra can help ease discomfort.
• Applying a warm or cool compress may provide some relief from tenderness.
• Some women find that limiting caffeine in their diet helps reduce breast pain and tenderness associated with cysts.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.