A body temperature of 37.3°C goes down when you sweat because sweat carries away the heat, thus lowering the body temperature. Therefore, when you don’t sweat, your body temperature is still high. 37.3℃ may be caused by colds, autoimmune diseases and so on. 1. colds: colds may be caused by the body cold, but also may be the cause of infection factors, after the disease will lead to central body temperature dysfunction, resulting in the patient’s body temperature 37.3 ℃ sweating will go down without sweating is 37.3 ℃, sweating water evaporation to take away the heat, the body temperature falls. 2. Autoimmune diseases: autoimmune diseases generally have rheumatoid arthritis, systemic vasculitis, hyperthyroidism, etc., after the disease will lead to the occurrence of their own antigenic immune response, water evaporation after sweating to take away heat, the above symptoms. In addition, pneumonia, tonsillitis, etc. may also lead to patients with body temperature 37.3 ℃ sweating will go down without sweating is 37.3 ℃, need to go to the hospital to do a comprehensive examination to determine the cause of the disease.