Pain in your breast can range from mild to severe, and may be accompanied by other symptoms such as redness, swelling and fever. Depending on the cause, pain in your breast can be treated with home care such as hot packs or ibuprofen, but severe or persistent pain may require medical treatment. According to the Mayo Clinic and the National Library of Medicine, causes of pain in one breast include infections and tumors.
Pulled Muscle
Pulling a muscle in your chest can result in pain, redness and swelling in the area of your breast, especially in the outer area toward your armpit.
Trauma
An injury to your chest from an auto accident, assault or surgery in the area of your chest can cause trauma to your breast and result in pain.
Cysts
Cysts are fluid-filled sacs that can occur in your breast tissue and can result in redness, swelling and pain in one breast.
Plugged Duct
If you are breastfeeding, a plugged milk duct can cause a backup of milk in your breast and can result in pain until the plug is loosened.
Infection
An infection in your breast, also called mastitis, can cause pain in one breast that is accompanied by red streaks across the breast, swelling and skin that is tender to the touch.
Tumors
A benign or malignant (cancerous) breast tumor may cause you to have pain in your breast, and a mammography or biopsy may be necessary for diagnosis of this condition.
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