Chemotherapy is a common treatment for stomach cancer. Due to the toxic side effects of chemotherapy drugs, it may cause symptoms of stomach discomfort and pain. Here are some reasons why your stomach may hurt more after chemotherapy: 1. Side effects of drugs: Chemotherapy drugs can cause stomach irritation or inflammation, leading to pain and discomfort. 2. Inflammation of the stomach lining: Chemotherapy may cause damage and inflammation of the stomach lining, further causing pain. 3. Adverse reactions to the digestive system: Chemotherapy drugs may affect the normal function of the digestive tract, leading to increased gastric acid secretion, stomach pain and indigestion. 4. Neuropathic pain: Chemotherapy may cause abnormal sensitization of sensory nerves, which in turn causes stomach pain. 5. Other complications: In addition to being directly affected by chemotherapy drugs, chemotherapy may also cause other complications, such as infection, gastrointestinal bleeding, etc., which may cause worse stomach pain. If you are experiencing worse stomach pain after chemotherapy, it is recommended to inform your doctor in time so that they can evaluate and treat your symptoms. The doctor may adjust your medication dosage or give other treatments to relieve pain and discomfort.