Loss of smell after a cold usually takes 3-5 days to recover in mild cases; in severe cases, it usually takes about 7 days to recover. Cold can manifest as respiratory symptoms and systemic symptoms. Due to local inflammation of mucous membrane, nasal mucous membrane congestion, edema, increased secretion and loss of sense of smell may occur after a cold, which is a temporary phenomenon and does not require special treatment. In general, the sense of smell can be effectively restored in about 3-5 days after active treatment of cold, but in some severe cases, the recovery time may be longer and it may take about 7 days to restore the sense of smell. If the patient’s sense of smell does not improve significantly after 7 days, or even decreases further, it is recommended to consult the ENT department in time to rule out sinusitis, early nasal polyps, olfactory nerve tumors, etc. In addition, during the period of cold, take proper rest, drink more water, avoid eating spicy and stimulating food, and avoid contact with alcohol and tobacco.