The pain in the patient’s lower armpit may be caused by swollen lymph nodes, lymph node inflammation, or it may be caused by paronychia, so it should be judged jointly according to whether there is an obvious lump or mass in the patient’s lower armpit, or combined with the location of the pain, as follows: 1. Swollen lymph nodes, lymph node inflammation: it can occur in any place in the lower armpit, the local pain is more obvious, and it is possible to touch the obvious The swollen lump, or lymph node, is a lesion caused by bacterial infection, and it is usually recommended to take oral antibiotics for symptomatic treatment, and the pain can be relieved after the inflammation disappears. 2. Parametrium: The pain caused is usually in the lower front of the armpit, above the outer mammary gland, and the parametrium may also be painful before menstruation, mainly caused by hyperplasia of the internal glandular tissue of the breast. It is recommended that the patient can have an ultrasound examination to further clarify the diagnosis and usually take oral Chinese medicine for symptomatic treatment.