Pain below the middle of the chest may be related to angina, digestive system diseases, traumatic fracture, costochondritis and so on. 1. Angina: this position in the middle and lower chest may be related to angina pectoris caused by myocardial ischemia, especially with high blood pressure, coronary heart disease, it is likely to cause angina pectoris due to fatigue, emotional excitement, resulting in pain symptoms. 2. Digestive system diseases: such as gastritis, gastric ulcer, gastroesophageal reflux disease, esophagitis and other diseases, due to gastric acid stimulation and other reasons, the patient will also show the pain in the middle and lower part of the chest. 3. Traumatic fracture: external violence on the sternum may lead to sternum fracture or soft tissue injury in the middle of the chest, which may cause pain in the middle and lower part of the chest. 4. Costochondritis: mostly caused by non-infectious factors, chest pain and pressure pain can be manifested as pain in the middle and lower part of the chest, and redness, swelling, heat and pain of local skin can be caused by infectious factors. The pain may radiate to the back of the shoulder, armpit, cervical and thoracic region, and may be aggravated by deep breathing, activity or exertion. The causes of pain in the lower middle of the chest are complex, and it is necessary to go to the hospital in time for examination and then targeted treatment under the guidance of the doctor.