The main reasons for waking up with stomach pain in the morning are cold at night, irritable bowel syndrome and chronic gastroenteritis. 1. Cold at night: the general night temperature is much lower than the daytime, if you sleep at night without a good blanket, resulting in a cold stomach, will stimulate the gastrointestinal tract to accelerate peristalsis, or even spasms, stomach pain in the morning after waking up. 2. Irritable bowel syndrome: due to nighttime cold, dinner stimulation and intense mental stimulation and other reasons triggered by irritable bowel syndrome, which can lead to gastrointestinal power disorders and intestinal spasms, so you will feel stomach pain after waking up in the morning. 3. Chronic gastroenteritis: If there is chronic inflammation in the gastrointestinal tract, or sleeping bile, pancreatic fluid or intestinal fluid flow back into the stomach in large quantities, which can trigger an acute attack of chronic gastroenteritis, the morning woke up after the attack of the disease will be stomach pain. If you wake up with stomach pain in the morning, go to the hospital in time to receive professional medical treatment.