Cold fire generally refers to the external cold and internal heat syndrome, most often see cold (cold) fever, no sweat, body pain, accompanied by irritability and thirst, constipation and other symptoms. External cold and internal heat evidence for the external evil evil heat and surface cold has not been resolved, or there is internal heat, but also cold evidence. Symptoms of surface cold: due to the cold attack on the surface of the muscle, there will be fear of cold fever, may be accompanied by no sweat, cough, cough phlegm, nasal congestion, headache and body pain and other symptoms. Symptoms of internal heat: Usually due to the cold evils that have been stored for a long time and turned into heat, or due to internal heat, which can be accompanied by yellow phlegm, irritability and thirst, constipation, dark yellow urine, etc. If the patient has the above symptoms, it is necessary for him to take a rest. If the patient has the above symptoms, need to go to the regular hospital in time, under the guidance of the physician standardized treatment.