Severe bloating always after quitting smoking may be caused by withdrawal reaction or gastrointestinal diseases after quitting smoking. 1. Withdrawal reaction: If the patient has been smoking for a long time, there will be withdrawal reaction after suddenly quitting smoking, which will lead to gastrointestinal dysfunction, nausea and want to vomit, abdominal distension and dizziness, and loss of appetite and other problems. After the digestive dysfunction, the gastric emptying ability is reduced, and a large amount of gas can not be absorbed by the gastrointestinal tract, which will lead to the sudden cessation of smoking patients to appear bloating and severe symptoms. 2. Gastrointestinal diseases: patients smoking easily lead to the occurrence of gastric ulcers, so that patients have gastrointestinal diseases, when patients quit smoking, gastrointestinal diseases still exist, will lead to gastrointestinal digestive disorders, leading to gastric dynamics insufficient, slow emptying, will lead to the symptoms of abdominal distension after quitting smoking. When the problem of bloating after quitting smoking persists for a long time, it is best to go to the hospital for examination and take appropriate treatment under the advice of the doctor.