The pain inside the left bone of the stomach may be related to the following causes: 1. Stomach diseases may exist, such as acute gastritis, gastric ulcer and other diseases. 2. Pancreatic-related diseases may exist. This type of disease is often seen in patients after heavy drinking or overeating, and may be accompanied by pain in the left side of the ribs and the lower back. 3, there may be chest wall-related diseases, such as chest wall phlebitis or intercostal neuralgia. The former is mainly due to inflammation of the veins in the chest wall, while the latter is often due to infection with the herpes zoster virus, which inflames the intercostal nerves. 4. There may be cases of costochondritis. This type of disease is often due to cold or dull contusion around the rib cartilage, which subsequently causes inflammation of the rib cartilage and may cause pain in the left quarter rib.