Coughing of stomach cancer may be related to bad living habits or autoimmunity, or it may be caused by lung metastasis. In terms of treatment, general therapy, drug therapy and systemic chemotherapy can be adopted, and the specific therapy needs to be analyzed according to the cause. 1. Related to bad habits: If you have the habit of smoking for a long time, consider that the reason for coughing may be caused by long-term smoking stimulated by cigarettes. This situation is generally quit smoking will slowly ease, do not need to do special treatment. 2. Related to low immunity: during the treatment of gastric cancer patients, due to the use of chemotherapeutic drugs, it may lead to the decline of immunity, and if there is no local warmth, the cough will be triggered after getting cold. If the cough is mild, keep warm and drink more warm water; if the cough is severe, take cough suppressant under doctor’s guidance to relieve it, such as cough syrup. 3. Lung metastasis: If the cancer cells have already metastasized to the lungs, the patient may also cough, and the cough is usually more violent. After confirming lung metastasis, patients need to consult doctor in time, and the treatment options include chemotherapy, targeted therapy, immunotherapy, etc., which should be chosen after doctor’s comprehensive judgment on patients. For patients with severe cough, it is recommended to consult a doctor for further examination to clarify the cause of the disease, and then treat the symptoms according to the doctor’s recommendations.