The hard lump in the male breast is considered to be caused by the following conditions: 1. caused by adolescent breast enlargement, which is due to the patient’s endocrine disorder, most typically a hard lump in the breast, and some patients may experience pain. 2. caused by the patient’s insufficient androgen secretion or excessive estrogen secretion, which may be due to long-term use of hormonal drugs or their own liver disease or kidney disease. 3, It may be caused by the normal development of the breast during puberty, which can be treated without treatment and will subside on its own after puberty. 4. It may also be caused by injury to the breast. If there is a significant change in the lump and the pain is aggravated, it is best to go to the relevant department of the hospital in a timely manner and then under the guidance of the doctor for relevant treatment.