Patients with left upper abdominal discomfort, the common causes are mainly the following: 1. Stomach lesions such as gastric ulcer, chronic gastritis, gastric malignant tumor, etc. The nature of the lesion is clarified through gastroscopy. For inflammatory or ulcerative lesions, the gastric mucosa is protected by oral omeprazole, Daxil tablets, colloidal bismuth pectin and other drugs to alleviate the symptoms of patient discomfort. For malignant tumor lesions, timely surgery to remove the tumor is needed to achieve a complete cure. 2, the left side of the lung with serious infection, will also affect the left upper abdomen caused by distension and discomfort, through the lung CT examination can clarify the patient’s specific condition. The patient’s left upper abdominal pain and discomfort can be improved through nebulized inhalation, enhanced sputum excretion and anti-infection treatment, which can control the lung infection more quickly. 3, patients with left kidney stone accumulation can also cause radioactive pain in the left upper abdomen and lower back. Patients can be accompanied by nausea and vomiting. Through urological ultrasound examination, the nature of the lesion can be clarified, and timely symptomatic treatment can be performed to improve the clinical symptoms of patients.