Sudden fear of cold may be caused by external wind-cold, but the exact cause needs to be decided in conjunction with the patient’s other symptoms. Sudden fear of cold may occur in patients with external wind-cold, which is often accompanied with symptoms such as malignant cold (fear of cold), fever, headache, sneezing, generalized body aches, nasal discharge, and coughing. Patients with external wind-cold infection can be treated with medicines such as ephedra soup and wind-cold and flu granules. Ephedra soup has the efficacy of sweating and relieving the surface of the body through sweating, promoting the lungs and calming the asthma. It is the main treatment for external wind-cold syndrome. Symptoms include malignant cold and fever, head and body pain, no sweating and wheezing, thin white coating on the tongue, and floating tight pulse. Wind-cold and cold particles have the efficacy of detoxifying the surface and sweating, dispersing wind and dispersing cold. It is used for wind-cold cold caused by fever, headache, cold, no sweat, cough, nasal congestion, runny nose. If the symptoms of sudden coldness are not relieved for a long time or accompanied by other discomforts, consult a doctor in time to find out the cause and carry out targeted treatment.