In some cases, the swelling of lymph nodes in the armpit is not serious, and in other cases, it is more serious, and it depends on the triggers that cause the swelling of lymph nodes. If it is caused by bacterial infection or viral infection, which is not serious, you can go to the hospital to complete the relevant examinations, such as blood routine, C-reactive protein, ultrasound, etc., and according to the results of the appropriate medication, and at the same time, you need to increase the amount of drinking water, and increase the amount of rest. If the lymph node enlargement is caused by tumor, which is more serious, such as breast cancer, it is necessary to improve the relevant examination as soon as possible, perform resection of the primary tumor, and then cooperate with lymph node dissection, and may need to be given chemotherapy, targeted drug therapy, traditional Chinese medicine, and so on in the later stage. Therefore, after discovering enlarged lymph nodes, it is necessary to go to the hospital as soon as possible to clarify the cause of the disease, and do not use medication by oneself to prevent delaying the treatment.