Chest tightness may be caused by bradycardia, cardiac neurosis, vegetative nerve dysfunction, etc. Generally speaking, the symptoms of chest tightness will be relieved after exercise. 1. Bradycardia: When heart disease causes abnormal slowing of the heartbeat, resulting in hypoxia and ischemia in the body, it will lead to the symptoms of chest tightness, after exercise, it will make the heart beat to recover the symptoms, and the chest tightness will be improved. 2. Cardiac neurosis: In most cases, it is due to prolonged mental stress, tension and anxiety, which causes the dysfunction of the nervous circulatory system and slows down the blood circulation, leading to the symptoms of chest tightness. After appropriate exercise, the mood is in a state of relaxation, will show that the phenomenon of chest tightness has improved. 3. Vegetative nerve dysfunction: prolonged overstress, mental stimulation of the sympathetic nervous system or parasympathetic nervous system and the collaboration of the two problems, resulting in cardiac dysfunction, which will cause chest tightness symptoms. After exercising, you can relieve stress and vent your emotions, which to a certain extent will relieve the symptoms of chest tightness. Chest tightness can be caused by a variety of reasons, some of which may aggravate the symptoms of chest tightness after exercise, and you should go to the hospital in time for relevant examinations and treatments to avoid adverse effects on your health.