Fever ear cold, is not the performance of the disease is improving, is the performance of the disease is about to be serious, is the patient’s condition aggravation of an early manifestation of the clinical need to raise vigilance. Because patients with fever in the early days, some of the peripheral circulation of the capillaries in the whole body is in a state of contraction, such as the patient’s ears, fingertips, toes and other parts of the cold sensation, this is because of the contraction of the capillaries, the local blood supply does not appear this performance. Once with the patient’s generalized fever further aggravated, the peripheral circulation will be rapidly unfolded, resulting in capillary diastole, resulting in accelerated blood flow, then there will be ears, hands and feet and other parts of the fever, hot performance. So clinically for patients with fever if some peripheral circulation such as the ears become cool, clinically must be vigilant. It is the early manifestation of the patient’s further fever, and should be given active treatment.