While we often hear about the importance of checking our breasts for any unusual lumps or changes, many women are now talking about another condition known as “breast mice.” The name might sound odd, but these are actually fibroadenomas, which are smooth, movable lumps that can shift under the skin when touched. They can occur at any age, though they’re more common in younger women. But are they cancerous? Discovering a lump in your breast can be alarming for anyone, but these “mice” are a harmless, non-cancerous breast condition that usually doesn’t require treatment.What Are Breast Mice?The term “breast mice” is a nickname for fibroadenomas which are benign (non-cancerous) breast lumps that move easily under the skin. The name comes from their tendency to slip away when you press on them, almost like a small mouse running off.A fibroadenoma is a smooth, solid lump made up of both fibrous and glandular tissue. In most cases, it is completely harmless, though in very rare situations, a fibroadenoma may contain cancerous cells, according to the Cleveland Clinic.In many cases, fibroadenomas shrink or disappear on their own. Your doctor may monitor them over time or, if necessary, suggest surgery to remove the lump.What Are the Types of Fibroadenomas?There are two main kinds of fibroadenomas:Simple fibroadenomas are the most common type. They are smaller and don’t increase your risk of breast cancer. Under a microscope, the tissue appears uniform, meaning the cells look similar throughout.Complex fibroadenomas are more often found in women over 35 and tend to be larger. When examined, they may show some variation in cell appearance, and your doctor might notice small calcium deposits or cysts on a mammogram. These may slightly raise your risk of breast cancer compared to women with no breast lumps. Complex fibroadenomas make up about 15% of all cases.What Do Breast Mice Look and Feel Like?Breast mice can range from smaller than a marble to about the size of a golf ball. They often appear suddenly and usually stay the same size, though some may shrink or grow over time. The lumps are usually firm and rubbery, but some women find them difficult to locate precisely.According to the Royal Women’s Hospital, if you press on the lump, it will likely move away from your fingers — hence the term “breast mouse.” Most fibroadenomas measure around 1 to 3 centimetres and are classified as simple fibroadenomas.Why Do Breast Mice Appear?Fibroadenomas typically develop during puberty and are most common in women in their twenties and thirties. They’re influenced by hormonal changes, which means they can change in size during the menstrual cycle or pregnancy.Do Breast Mice Increase the Risk of Breast Cancer?For most people, having a fibroadenoma doesn’t raise the risk of developing breast cancer. However, those diagnosed with a complex fibroadenoma may have a slightly higher risk.If you are concerned about your breast health or notice any new lumps or changes, it’s best to consult your GP or breast specialist. Even though breast mice are usually harmless, staying alert to changes in your breasts is always the safest approach.
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