The causes of chest tightness, dizziness, fatigue and weakness in patients may be the following: 1, it may be caused by heart-related diseases, such as the presence of chronic cardiac insufficiency in patients, myocardial ischemia will cause patients to have symptoms of chest tightness, fatigue and weakness, because of the reduction of blood ejection from the heart, causing insufficient blood supply to the brain, patients will show dizziness; 2, this symptom may also be caused by overexertion. It belongs to the neurological disorder, this kind of patients are mostly usually more anxious, nervous, neurological weakness caused; 3, the patient chest tightness, dizziness, fatigue, weakness, may also be caused by cerebrovascular disease, the most common to consider there is cerebral arteriosclerosis, cerebral vascular severe narrowing, cerebral blood supply is insufficient, will lead to sympathetic nerve stimulation, the patient will also show symptoms of chest tightness.