Left chest bone pressure pain may be due to costochondritis, rib fracture, intercostal neuritis and other diseases. 1. Costal chondritis: the etiology of costal chondritis is not yet clear, it may be caused by viral infection, endocrine abnormality, chronic strain of thoracic and rib joint ligaments and other factors. Patients may have chest pain, which may radiate to the back and abdomen, and pressure on the rib cartilage area may cause tenderness. 2. Rib fracture: Rib fracture is caused by direct or indirect violence to the ribs. Rib fracture can stimulate the intercostal nerves, resulting in chest pain, which is aggravated by coughing and deep breathing, and can be painful when pressed. 3. Intercostal neuritis: Intercostal neuritis is mostly caused by herpes zoster, and can also be induced by nerve compression, infection, trauma and other factors. Patients may have pain in the intercostal area, which is aggravated when pressed. There are many reasons that lead to the patient’s left chest bone pressure pain, it is recommended that the patient promptly identify the cause of the disease.