Seasonal colds are caused by the change of seasons, where the difference between day and night temperatures is significant. This cold is due to external pathogenic wind, which is related to a decrease in the body's immune capacity and exposure to cold. It involves infection by rhinoviruses and can lead to symptoms like runny nose, sneezing, sore throat, headache, and fever. It is advised to drink plenty of water, rest, monitor body temperature, and treat symptoms accordingly. If there are no other complications, complete recovery can occur within 3 to 7 days.