The tightness but not pain in the chest is because the body is in a state of tension or pathology: for example, coronary heart disease; it should be relieved by relaxing the emotions and taking medication.
First of all, whether one is sick or not, when one is in a state of anxiety and tension, one will feel tightness in the chest; one should keep oneself in a calm state of mind and relieve anxiety by deep breathing. Usually should also be more exercise, more to participate in some outdoor activities to relieve their own tension, strange feeling.
Secondly, if the body has some pre-existing underlying diseases, such as chest surgery or coronary heart disease, coronary heart disease if oral nitroglycerin does not relieve, should go to the hospital, under the guidance of the doctor, with the doctor for rehabilitation. Do not be at home to self-conditioning, or blindly take some means of treatment.