When sweating with armpit pain occurs, consider that it is caused by axillary folliculitis, which can result in hard swollen bumps or boils in the armpits, which are rich in sweat glands. It is also considered to be inflammation of the axillary lymph nodes, which is caused by excess damp heat and fire in the body. If you feel a soybean-sized granular nodule in your armpit by palpation, consider it to be a lymph node problem, and if you feel a hard and large bump, it is a folliculitis problem. Both diseases are related to internal fire and the treatment is basically the same. The most common causes of pain in the armpit are these two. The diagnosis can be made based on the patient’s age, medical history, symptoms, signs and physical examination, and can be cured by active antibiotic treatment after diagnosis.