Smoking triggered stomach pain, the main reasons are as follows: 1, bronchospasm: smoking can trigger bronchospasm, driving the diaphragm up and down vibration, due to diaphragmatic spasm triggered by abdominal muscle convulsions, which led to abdominal pain; 2, allergic reaction: smoke inside the nicotine and special nicotine components, can produce stimulation of the human body, triggering an allergic reaction, which appeared in the abdominal pain. In addition to abdominal pain, some patients will also trigger gastrointestinal reactions, vomiting and so on; 3, central stimulation: smoking triggers central stimulation, some people may experience nausea, vomiting and other reactions, resulting in the entire epigastric pressure increases, thus triggering abdominal pain.