Asthma sufferers can swim. In fact, swimming is a very beneficial form of exercise for respiratory diseases. It can enhance the respiratory tract's ability to resist diseases and increase lung function. Asthma is an allergic reaction triggered by exposure to allergens, causing bronchial smooth muscle contraction, and patients often exhibit symptoms like coughing, chest tightness, and shortness of breath. Swimming can help strengthen the body's resistance and thus reduce the occurrence of asthma attacks. However, some patients may be allergic to chlorine-based disinfectants. When swimming, it is important to be aware of whether the water contains an excessive amount of chlorine disinfectant and whether the water quality is clean, as this could also trigger an acute asthmatic attack.