The common causes of underarm pain are: first, lymphadenitis, mainly due to the infection of lymph nodes, bacteria, or viral bacteria invading lymph nodes, resulting in inflammatory proliferation and swelling. Second, lymph node tuberculosis, tuberculosis can cause lymph node granulation hyperplasia and swelling, pain. Third, lymph node metastasis of malignant tumors is common in breast cancer. Lymph node metastasis of chest malignant tumors can cause axillary pain. Fourth, there may be sebaceous gland cysts in the armpit. The sebaceous gland cysts are mainly due to the obstruction of sebaceous gland secretion, and the formation of local masses. If infection occurs, it may cause axillary pain, which requires thorough treatment such as surgery.
