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What causes underarm and breast pain?

I'm a 22 year old woman with above-average sized breasts. Two weeks ago, I started feeling like the area under my arm was swelling, and it started to hurt. Now the pain is radiating into my breast. Should I go to the doctor?
There can be several causes for pain and swelling under the arm and in the breast. One common cause would be a swollen lymph node in the armpit. This can occur for several reasons including a scratch or infection in the arm. Sometimes, swelling of the lymph node can lead to formation of an abscess or collection of pus. Collections of pus can also form after infection of a hair shaft or a pimple forms in the armpit. Pain in the armpit can easily radiate down into the breast. If you have a painful, red, swollen area in the armpit it should therefore be investigated as many of these require lancing of the pus or taking oral antibiotics to get rid of the infection. Other cause of pain and swelling in the breast can include an infection of the breast, called mastitis. This is unusual in women who are not breastfeeding, but it can happen. If you have a red or inflamed area in your breast, this should be checked out by a doctor as well for potential antibiotic treatment. Rarely, swelling under the arm can be a sign of a more serious illness, such as a form of cancer called lymphoma. Regardless, the best first step is to have a good physical exam by your primary care doctor as soon as possible.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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