Pain in the chest after cool weather is considered to be caused by chronic gastritis. Chronic gastritis can be characterized by vague pain and distension in the upper abdomen, sometimes the pain will be more intense, accompanied by abdominal distension, nausea, vomiting, acid reflux, belching and other symptoms. Especially after getting cold, or eating unclean food, the pain will be aggravated, which can be slightly relieved after resting, or applying hot towel externally. If there is bleeding in the mucosa of the stomach, it can be manifested as black stools, which requires gastroscopy to be clear, and can detect some lesions in the mucosa of the stomach, and, if necessary, take a small amount of tissue out to do pathological examination, and can also detect Helicobacter pylori bacteria in the stomach. If chronic gastritis exists, oral medication is needed for treatment, such as omeprazole and so on.