Feeling cold but not feverish may be caused by being in a cold environment, early infection, mental stress and other factors, and should consult a doctor in time to clarify the cause of the disease. 1. Cold environment: When the patient is in a cold environment in winter or in a low temperature, the low temperature will make the blood vessels constrict and cause the blood circulation of the body to slow down, so that the surface temperature of the skin decreases, and thus the phenomenon of chills occurs. 2. Early stage of infection: body temperature usually does not rise in the early stage of infection, but the stimulation of inflammatory factor release will cause microcirculation contraction and symptoms such as cold and chills will appear. 3. Mental stress: when the patient is overly frightened or does not have enough rest, he or she may be in a state of high mental tension, leading to neurohumoral regulation disorders. At this time, the neurohumoral regulation mechanism will prioritize the protection of the heart, brain, kidneys and other important organs, thus slowing down the circulation of the limbs and skin, resulting in patients feeling cold. If patients frequently experience cold symptoms, it is recommended that they go to the hospital in time, and follow the doctor’s instructions for treatment after clarifying the cause of the disease, so as to avoid delaying the condition.