Air conditioning cold is also a very common factor that triggers the onset of colds. Clinically speaking, an air conditioning cold is typically caused by staying too long in an air-conditioned room during the hot summer, where the temperature is set too low, leading to clinical symptoms such as nasal congestion, runny nose, and fever. Even for colds caused by catching a chill, the symptoms can vary in severity among patients, and not all patients will exhibit the same clinical symptoms. Some patients may not show obvious coughing, while others might develop coughing symptoms due to exposure to air conditioning. Therefore, it is necessary to consider the specific circumstances of each patient, as the immune function of each patient varies, leading to different clinical symptoms after catching a chill.