What causes pain in the left side of the stomach?

Stomach pain may be caused by gastritis, gastric ulcer, gastric cancer, etc. The analysis is as follows:

1. Gastritis

patients stimulate the left stomach tissue due to inflammatory reaction, resulting in damage, which may cause pain.

2. Gastric ulcer

If the patient's left stomach mucosa is severely damaged and produces a large amount of gastric acid, acting on the damaged mucosa, causing further damage to the mucosa, causing pain in the left stomach.

3. Gastric cancer

If the patient has gastric cancer, cancer cells stimulate the left stomach tissue, causing damage, which may cause pain, and will gradually worsen with the development of the disease.