Pressing pain under the left breast in men without pressing may be related to conditions such as breast hyperplasia, pleurisy and costochondritis. 1. Breast hyperplasia: men may also have symptoms of breast hyperplasia, there may be hard lumps in the breast, and pain may occur after intense emotions or temper tantrums, or there may be painful symptoms when pressed. 2. Pleurisy: If the patient has pleurisy, the patient will have breathlessness, coughing as well as fever, etc. When pressing the lower part of the left breast, there will be obvious pain, and there will be no pain in the case of non-pressing. 3. Costochondritis: If the patient has costochondritis, there will be redness and swelling of the skin in the costochondral area as well as pain when pressed. Should consult a doctor in time, do a systematic examination, clear the cause of the disease and then symptomatic treatment, so as to avoid delaying the condition.