What causes stomach pain and nausea?

Stomach pain is stomachache, stomachache nausea may be caused by gastritis, gastric ulcer, cholecystitis and other reasons. 1. Gastritis immune system damage, pathogen infection and other reasons can cause gastritis, the patient's gastric mucosa inflammatory lesions, inflammatory factors may cause irritation to the gastric mucosa, causing stomachache, nausea and other symptoms. 2. Gastric ulcer improper medication, Helicobacter pylori infection and other reasons can cause gastric ulcer, leading to ulcerative lesions in the patient's gastric mucosa, gastric juice constantly stimulate the damaged gastric mucosa, but also nausea, stomachache and other symptoms. 3. Cholecystitis bile duct blockage, bile duct stones and other reasons can cause cholecystitis, the patient's gallbladder inflammation reaction, may affect bile excretion, resulting in food can not be digested and absorbed in time, this symptom is easy to occur.