A little tightness in the chest can be considered related to coronary heart disease, breast disease, lung disease, pleural disease and other causes. 1. Coronary heart disease: when coronary artery stenosis occurs, strenuous activities, overwork, cold stimulation and other factors can lead to an increase in myocardial oxygen consumption, resulting in myocardial ischemia and hypoxia. Thus, angina pectoris occurs, making the precordial area appear taut like discomfort. 2. Mammary gland diseases: such as mastitis, breast hyperplasia and other mammary gland diseases, can appear chest pain, can also be manifested as the symptoms of chest tightness. 3. Lung diseases: such as lung infections, tumors, tuberculosis and other diseases. In addition to coughing, coughing up sputum and other uncomfortable symptoms, there may also be tightness and tightness in the chest. 4. Pleural diseases: such as pleurisy, pleural tumors and other diseases, in addition to a sense of breathlessness, it will also make the chest tight or tight feeling. At the same time, some anxious and depressed patients, autonomic dysfunction patients, arrhythmia will also appear conscious chest tightness. There are many causes of tightness in the chest, and when there is some tightness in the chest, it is recommended to seek medical attention as soon as possible, so that a clear diagnosis can be made and treatment can be carried out under the guidance of the doctor.