Back fork is a very common phenomenon, the appearance of back fork: 1, may be caused by muscle strain during strenuous exercise, some patients due to the lack of necessary physical exercise, physical quality is relatively poor, in strenuous exercise may cause back muscle strain. 2, if the strenuous exercise before the adequate warm-up preparations, patients in strenuous exercise due to intercostal muscle, or diaphragm The muscle is stretched excessively, which may cause muscle tension or muscle spasm, so that the symptoms of forked breath may occur, and the patient often turns around or coughs when the pain is aggravated. The first thing to do in this case is to take rest and avoid strenuous exercise. In addition, attention should be paid to gentle movements when turning and bending to avoid aggravating the pain, and anti-inflammatory and pain-relieving drugs should be applied for symptomatic treatment.