A hard lump in the middle of the chest between the two ribs in men may be caused by normal physiological structure, fibroid tumor, trauma and other reasons. 1. Normal physiological structure: the connection between sternal stalk and sternal body, i.e. the sternal angle is a raised structure, which may be felt as a hard lump here. 2. Fibroma: This is a deep, ill-defined, hard mass that can occur in the middle of the chest in men in the middle of the two ribs. 3. Trauma: If the middle of the chest is hit by an injury, it can cause fracture deformity or subcutaneous hematoma, which can be manifested as a hard lump. It is recommended that men with a hard lump in the middle of the chest between the two ribs should go to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor.