Photodisc/ThinkstockBy DR. JENNIFER ASHTON, ABC News Senior Medical Contributor

A lump is the most common symptom of breast cancer so, naturally, women worry if they feel a mass or notice a change in their breast tissue.

But many breast lumps are common and most are not cancerous. That’s why it’s important to have them checked by a doctor to be absolutely sure. Most lumps and changes can be found during a breast exam.

Women may notice breast lumps that come and go with their menstrual cycle. This is common and normal. Noncancerous changes, growths like cysts or connective tissue changes called fibrosis, are common, too.

Breast infections like mastitis can also cause pain and tissue changes.

When it comes to lumps that are cancerous, early detection and knowing your body are key.

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