There is gas in the middle of the chest against the pain, the main common clinical causes are as follows: a. Spontaneous pneumothorax, mostly seen in patients with large pulmonary alveoli spontaneous rupture of the alveoli during strenuous activities can cause spontaneous pneumothorax. A large amount of gas in the chest cavity compresses the lung tissue, and there is pain in the middle of the chest with gas against it. For patients with respiratory difficulties, CT and X-ray examination of the chest can be improved, and closed drainage of the chest cavity can be performed as soon as possible, so as to reduce the symptom of compression of the lung tissue by the gas in the chest cavity. Secondly, patients with acute gastric dilatation may suffer from pain and discomfort in the chest due to acute dilatation and compression of the stomach. Patients can improve the abdominal CT examination, clear the nature of the lesion, as soon as possible, gastrointestinal decompression, suction out of the gastric gas and fluid. Patients should be instructed to fast absolutely, strengthen the intravenous rehydration supportive therapy, after the gastric contents are pumped, the symptoms of chest extrusion can be relieved more quickly.