Hidden pain in the breast position of the left chest of men may be related to breast hyperplasia, chest soft tissue contusion, cardiovascular disease, intercostal neuralgia and so on. It is recommended that the patient go to the hospital in time to improve the relevant examination to clarify the cause of the disease. 1. Mammary gland hyperplasia: men can also develop mammary gland hyperplasia, the main symptom is breast pain, and some of them can have breast nodules or lumps when touching the breast. 2. Chest soft tissue contusion: Chest impact, pressure, etc., resulting in soft tissue contusion around the left chest, causing pain. It may be accompanied by localized skin bruising and swelling. 3. Cardiovascular diseases: such as coronary heart disease, angina pectoris, pericardial effusion and other diseases, there may be a hidden pain in the left breast position. 4. Intercostal neuralgia: the symptoms of vague pain in the left breast position may occur due to the damage of the rib nerves in the left breast position for different reasons. The pain can be aggravated when coughing, deep breathing or sneezing. In addition, mastitis, breast fibroadenoma and breast cancer may also appear similar symptoms, leading to the cause of men’s left breast breast position hidden pain for a number of reasons, it is recommended that the patient to the hospital in time to improve the relevant examination, to clarify the cause of the disease.