There is a small lump under the armpit that presses the cause of the pain

Axillary hard mass accompanied by pressure pain, usually caused by mammary gland hyperplasia phenomenon. Breast hyperplasia is due to hormone levels in the body disorder, estrogen levels caused by high disease. Secondly, can not rule out the possibility of local lymph node enlargement. Suggestions: patients can go to the hospital breast department to see a doctor, find out the cause.