Lying in bed with a cold body, the first consideration is that the outside temperature is low, improper warmth measures and other physiological factors, followed by the consideration of the upper respiratory tract infection and other diseases. 1. Physiological factors: normal people lying in bed when the body cold, if there are no other symptoms, usually due to the external temperature is low, cold environment, the whole body blood circulation slows down, the skin surface temperature is reduced. At the same time, in the case of low temperature in the external environment, if the patient does not do a good job of their own warmth measures, such as not cover the quilt, do not wear clothes, etc., there will also be a cold body. 2. Upper respiratory tract infection: the disease is a common clinical acute, inflammatory diseases of the upper respiratory tract, mainly due to bacterial, viral and other pathogens infection, or the patient’s poor physical condition, cold, overwork and other factors. Patients often experience nasal congestion, runny nose, sneezing and other symptoms. At the same time, the more serious patients will also appear fever, chills and other systemic symptoms, which is manifested in lying in bed body cold. It is recommended that patients who are cold in bed keep themselves warm, and seek medical examination and treatment if symptoms such as nasal congestion are present.