Armpit pain is not necessarily breast cancer, but there are many reasons for armpit pain, as follows: 1. Body surface swelling: common ones are sebaceous cyst, fibroma, lipoma, parametrium, etc. This needs to be clarified by ultrasound in the armpit, and if necessary, complete excision of the swelling and pathological biopsy. 2. Lymph node enlargement: relevant examinations, such as blood routine, C-reactive protein, ultrasound, etc., need to be improved to clarify. 3. Trauma: Usually it is related to too strenuous exercise and can be clarified by going to the hospital for surgery. During the period of pain, avoid drinking drinks containing alcohol, do not eat too spicy food, and do not eat pickled food, etc. You can properly consume fresh fruits and green vegetables to promote the recovery of the body.