Colds, also known as upper respiratory infections, generally occur because the patient's immune function is weakened, leading to the condition. Many patients catch a cold due to exposure to cold, while others are infected by people with colds due to weakened immune function.

For patients with a cold who do not have a fever, we generally recommend engaging in appropriate exercise, which can help alleviate the symptoms of a cold. For instance, if a cold occurs during the cold winter months, swimming and participating in similar physical activities can be beneficial for enhancing the patient's immune function and aiding in quicker recovery from the illness. Therefore, it is acceptable for patients with a cold to swim.