The common cold can usually be cured in 5 to 7 days without any special after-effects; if the appetite decreases during this period, there may be a slight weight loss. 1. The common cold starts sharply and is mostly caused by viruses. The main symptoms are sneezing, nasal congestion, runny nose, cough, sore throat, etc. In severe cases, fever and headache may occur. Generally 5 to 7 days can be cured. There is no specific antiviral drug, and the treatment is mainly symptomatic, while paying attention to rest, drinking plenty of water and preventing secondary bacterial infections. 2. Colds generally have no special sequelae, but a small number of patients can be complicated by acute sinusitis, otitis media, bronchitis and so on. During the course of the disease, due to the rise in body temperature and the decrease in enzyme activity in the body, the patient will show generalized weakness and loss of appetite. If the nutritional intake is also insufficient, weight loss may occur, but usually the drop will not be too large. If there is any discomfort, please consult a doctor in time and follow the doctor’s instructions to standardize the treatment.