What should I do if I find a lump in my breast while breastfeeding?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Finding a lump in your breast while breastfeeding is often caused by common, benign issues such as a clogged milk duct, engorgement, a galactocele (milk-filled cyst), or mastitis (breast infection). However, in rare cases, a breast lump can indicate something more serious, including breast cancer. Because it can be difficult to tell the difference on your own, you should always have a new or persistent lump evaluated by a healthcare provider—especially if it doesn't go away after a few days of home care, feels hard or fixed, or is accompanied by fever, redness, or skin changes.

Not sure whether your symptoms warrant an urgent visit or can be managed at home? Every hour of uncertainty adds stress you don't need while caring for a newborn. Take a few minutes now to complete a free, instant, online symptom check to better understand possible causes and get clear guidance on your next steps.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if breast lump needs care today Discover likely causes of breast lumps See if breastfeeding lump is serious Find OTC relief for breast lump Find doctor for breastfeeding breast lump Discover home remedies for breast lump Understand if breast lump needs urgent care

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Explanation

Finding a lump in your breast while breastfeeding can be concerning, but it's important to know that many lumps are not cancerous. During breastfeeding, lumps can often be due to benign conditions like blocked milk ducts or infections.

What to Do:

Stay Calm: Many lumps are not serious.
Consult a Healthcare Provider: It is important to have any breast lump evaluated by a healthcare provider. They can determine if further tests are needed.
Common Causes: Lumps during breastfeeding can be due to benign issues like blocked milk ducts, which can cause swelling and pain, or infections like mastitis.
Breast Cancer: Although rare, breast cancer can occur during breastfeeding, so it is crucial to have any new or persistent lump checked.

Remember, while most breast lumps during breastfeeding are not cancerous, getting a professional evaluation is the best way to ensure your health and peace of mind. If you're experiencing symptoms and want to understand what might be causing them, you can use our free AI symptom checker to help guide your next steps.

(References)

Taib NA, & Rahmat K. (2020). Benign Disorders of the Breast in Pregnancy and Lactation. Advances in experimental medicine and biology, 32816261.
Petok ES. (1995). Breast cancer and breastfeeding: five cases. Journal of human lactation : official journal of International Lactation Consultant Association, 7669241.
Kulkarni D. (2020). Clinical Presentations of Breast Disorders in Pregnancy .... Advances in experimental medicine and biology, 32816260.

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