In clinical practice, there are two kinds of diseases that can cause undershirt distension. First, digestive system diseases. Some patients will have clinical manifestations of stomach distension and indigestion after eating, which will be accompanied by back distension, which is caused by the pressure of food on the stomach. Therefore, these patients usually have a past history of gastritis, gastric ulcer, peptic ulcer, and their symptoms will be relieved after taking oral antibiotic tablets and drugs such as omeprazole. Second, patients who are often sedentary, lack of exercise, will also lead to disorders of the back thoracic joint, this small joint disorders will lead to the entire back soreness, after lying down to rest the symptoms will be relieved, you can go to the hospital to do physical therapy, you can also paste ointment, the symptoms will be quickly relieved.