Many people often have pain in the upper abdomen or left and right upper abdomen when running, especially in the early morning. Medical experts believe that this is related to human respiratory muscle spasm. Respiratory muscles in human body mainly include diaphragm and intercostal muscle. If the diaphragm spasms, it will cause pain in the upper abdomen or left and right upper abdomen. When running, human organs will transition from a quiet state to a moving state. At this time, the metabolic process in the body is vigorous, the demand for the atmosphere and various nutrients suddenly increases, and the metabolic products of the human body are also accelerating excretion, which requires the respiratory system and cardiovascular system to improve work efficiency. However, because the function of internal organs can not be adjusted to the required state immediately, there is a contradiction between the moving organs and internal organs, and the respiratory system of the human body will speed up the breathing frequency and increase the breathing depth. People who have just started to practice long-distance running often only pay attention to increasing the breathing frequency, but ignore adjusting the breathing depth, which leads to the acceleration of the contraction frequency of breathing muscles and the tension of breathing muscles, thus causing spasms. The spasm of respiratory muscles can directly stimulate sensory nerve endings, thus making people feel pain. Experts suggest that warm-up exercises should be done carefully before running to prevent this phenomenon. Through warm-up, the internal organs of the human body can gradually enter the state of exercise. Running again at this time can avoid stomach pain, and even if there is stomach pain, the symptoms will be mild.

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