There are many reasons for chest tightness, nausea, dizziness, vomiting and fatigue, such as coronary heart disease, poor rest, history of neurosis and other causes. 1. bad rest: bad rest will cause the brain in a state of extreme fatigue, will cause the body to appear chest tightness, nausea, dizziness, want to vomit weakness and other symptoms, this situation generally only need to take a good rest can be improved. 2. Coronary heart disease: coronary heart disease chest tightness, mainly due to coronary artery ischemia caused by the ischemia is more serious when accompanied by nausea, dizziness, want to vomit the phenomenon of fatigue. 3. history of neurosis: with a history of neurological function of this disease will be in the stimulation of external factors, thus causing fright anxious angry and other bad emotions, accompanied by chest tightness nausea dizziness want to vomit symptoms. It is recommended that when this situation occurs, you need to go to the hospital for examination, to clarify the cause of the disease and timely symptomatic treatment.