Running bouts are a common clinical symptom, and there are three reasons for such bouts: 1, running after eating, when the body is digesting food, the blood flowing to the diaphragm will be relatively small, causing the blood in the diaphragm to decrease, which will lead to the phenomenon of spasm due to lack of oxygen, and the pain will increase; 2, not sufficiently warmed up before running, the body suddenly changes from a stationary state to a relatively Fast, intense exercise state, will lead to the emergence of rapid and relatively shallow breathing, triggering the contraction of the diaphragm, not fully coordinated, easy to produce forked breath; 3, shallow breathing when running, due to running breathing is too shallow, the tissue is not able to fully blood oxygen exchange, will lead to diaphragm spasm at the same time, back pain, dizziness, headache problems will occur. Therefore, when running must pay attention to the above three aspects, appropriate exercise, try to avoid running after a full stomach, etc., so that you can avoid running to form a fork.