Sports asthma can be triggered by strenuous or prolonged physical activity, such as participating in sports activities at school or chasing and playing in gym class. While we normally breathe using our nose to breathe in air, which purifies the air and makes it moist and warm, we use our mouths more when we exercise. Therefore, the main cause of exercise-induced asthma in winter is the large amount of cold, dry air that is inhaled by the mouth during exercise. In contrast, the airways of asthmatics are hypersensitive to changes in air temperature and humidity, and the associated muscles squeeze the airways in the lungs leading to narrowing or constriction of the airways. For asthma patients, swimming is a very good way to exercise. On the one hand, regular swimming can enhance lung capacity and improve the function of the human respiratory system; on the other hand, the air inhaled by patients during swimming is mild and humid, and the body is in a horizontal position in the water will allow the mucus accumulated at the bottom of the lungs to be evacuated; furthermore, the swimming process will not come into contact with various dusts and can avoid allergen stimulation, so swimming Therefore, swimming can be called the most ideal exercise for asthma patients. In particular, it is necessary to be evaluated by a doctor, to adhere to the medication prescribed by the doctor, to follow up regularly, and to have the asthma under control before considering moderate exercise. Seek medical attention as soon as you have a symptom attack. Symptoms of exercise asthma 1. cough; 2. wheezing; 3. shortness of breath; 4. chest tightness or chest pain; 5. restricted deep breathing; 6. unusual weakness during activity. For the vast majority of people, exercise asthma can be controlled or prevented by common asthma medications and related precautions (pre-exercise warm-up and post-exercise cool-down activities). All you need to do is bring these inhaled medications and use them 15-30 minutes before exercise to be able to prevent asthma symptoms. However, if you inhaled a short-acting beta agonist before exercise and still experienced asthma symptoms after exercise, then you should recommend that your doctor switch you to another controller medication or increase the inhaled dose of the medication. Exercise precautions: 1. Preventive medicine can be used before exercise under the advice of your doctor. 2.Do warm-up before exercise to make the respiratory tract gradually adapt to the load of exercise. 3. Avoid inhaling dry and cold air when exercising, and avoid exercising in cold winter or air pollution environment. 4.If exercise causes an asthma attack, stop exercising immediately and inhale bronchodilators. If there is no improvement, seek medical attention.