Chest pain after quitting smoking may be caused by an adverse reaction to quitting smoking, or it may be related to respiratory disease or heart disease. Chest pain after quitting smoking may be caused by withdrawal reaction, some people will have flu-like symptoms 1 to 2 weeks after quitting smoking, and may also have chest pain, chest tightness and other symptoms, most of which will not last too long, and will be slowly reduced and disappear, pay attention to rest and avoid exertion. If the chest pain is not alleviated after a period of time, there may be other causes, such as respiratory diseases, tuberculosis, pneumonia, lung tumors, etc., heart diseases such as angina pectoris, myocardial infarction and so on. Patients who experience chest pain when quitting smoking, if the chest pain is not relieved for a long time or continues to worsen, they should go to the hospital in time to do a checkup and find out the cause of the chest pain and then treat it under the guidance of the doctor.