### Patient: Hi doctor, I have been having some pain and soreness in my breast, and recently I noticed a lump or mass in my arm. What could be the problem?
### Doctor: Based on your symptoms, it is possible that you have a breast cyst. This is a noncancerous fluid-filled sac that can develop in the breast tissue and sometimes cause pain or discomfort. The lump in your arm could be a swollen lymph node, which can sometimes be related to breast cysts.