The specific treatment for pain in the chest near the armpit is as follows: 1. Swollen lymph nodes, if the lymph nodes are inflamed due to inflammation, pain and enlargement, cephalosporin can be infused to reduce inflammation. If breast cancer metastasizes to this area, chemical treatment is needed. 2. Trauma, if excessive friction or squeezing causes injury to the subcutaneous tissue here. If there is a wound, erythromycin ointment can be applied. 3.Parametrium, parametrium also contains breast tissue, and the problems that may occur in the breast may also occur in the parametrium. 4.Breast cancer, cancer patients with metastasis need to be highly alert to active chemotherapy.