Uncomfortable feeling of chest tightness may be related to the closed environment, mental stress, bronchial tumor, heart disease and other factors, it is recommended that patients go to the hospital as soon as possible, to clarify the cause of the disease as soon as possible, and actively cooperate with the doctor’s treatment. 1. Closed environment: When the environment is closed and the air is not circulating, the patient may suffer from chest tightness due to lack of oxygen, so it is recommended to open the window for ventilation and try to absorb fresh air. 2. Mental tension: patients may feel chest tightness when they are under mental tension and emotional depression, and the symptoms will be relieved after the patients get out of the environment of mental tension and emotional depression. 3. Bronchial tumor: after the gradual increase of bronchial tumor, it may block the gas flow in the airway, and the patient will have chest tightness, shortness of breath and other symptoms, which usually need to be treated by way of surgery. 4. Heart disease: when patients suffer from congenital heart disease, heart valve disease, coronary heart disease and other heart diseases, patients may feel chest tightness due to insufficient blood supply to the lungs, and patients need to be further examined to make clear diagnosis and symptomatic treatment. It is recommended that patients go to the local hospital as soon as possible, take proper rest and avoid strenuous exercise to prevent the symptoms from worsening.