The symptom of left chest pain when drinking water may be caused by gastric diseases, esophagitis and pleurisy, etc. It is better to consult a doctor in time for a clear diagnosis. 1. Gastric diseases: If gastric diseases such as gastric ulcer occur, drinking water may cause irritation to the lesion area, causing pain, and the pain radiating to the surrounding area may affect the chest. 2. Esophagitis: If the esophageal mucosa is damaged, drinking water may cause pain in the chest, accompanied by acid reflux and nausea. 3. Pleurisy: mostly caused by inflammation, followed by tumor and pneumothorax, usually unilateral cut-like superficial pain, coughing and inhalation can make the pain worse, and some patients have chest pain when drinking and swallowing. It is recommended that people with frequent symptoms of left chest pain when drinking water go to a regular hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the condition to bring adverse effects on the body.