There are many reasons for pain in the armpit near the breast, such as: 1. axillary lymphadenitis, often seen in the presence of infection, underlying disease, requires anti-inflammatory, anti-infective treatment and timely access to a hospital for treatment of the primary disease. If there are small nodules with fair mobility in the armpit, it is more likely to be axillary lymphadenitis. 2. costochondritis, mostly tingling pain usually not felt, back heavy or excessive fatigue will aggravate the condition. The actual pain is usually not felt, but it can be aggravated by heavy back pain or excessive fatigue. 3, muscle ligament pain, may be ligament strain or muscle fatigue, need ice, hot compresses after 48 hours, more rest, reduce the movement of lifting the arm, so as not to develop into habitual ligament strain, muscle strain. 4, parametrial or mammary hyperplasia, parametrial because of development problems left behind breast tissue, under the influence of hormones, parametrial and The normal breast will show pain performance.