There are many diseases that can cause severe stomach pain, acute appendicitis will have obvious pain, you can do ultrasound to confirm the diagnosis. After diagnosis, it can be treated with fluids or surgery, and after treatment, the stomach pain will disappear. Pancreatitis and cholecystitis, the same condition can occur. Pancreatitis requires routine blood and amylase tests, as well as a CT scan. In the early stages of the disease, it can be treated with antibiotics, and in patients whose symptoms are not relieved or are very severe, surgical treatment is needed, and soon after the treatment the stomach pain will be relieved or disappear. Cholecystitis requires routine blood tests and ultrasound to confirm the diagnosis, and cholecystokinin test and cholecystography if necessary. After diagnosis, medication or surgery is needed. Medication is for patients with relatively mild conditions, but surgery is needed if the treatment is not effective or the condition is too severe.