In hot weather, most people will feel tightness in the chest, with the feeling of not being able to breathe, mainly because the air pressure is relatively high, the amount of oxygen contained in the air is relatively small, most people will not affect the normal work and life, generally need to pay attention to rest, avoid too much exertion, but also appropriate to drink more water, stay in a cool place. If you are weak, have a bad heart or poor lung function will feel more obvious, if more serious and may cause breathing difficulties, usually need to take medication on time, appropriate oxygen therapy, if the heart is not good need to hospital consultation, also need to use cardiac diuretic drugs, poor lung function need to use bronchodilator drugs, also need to use effective antibacterial drugs as well as cough and asthma medication treatment The lung function needs to be treated with bronchodilators, effective antibacterial drugs and cough medicines.