If you have a low-grade fever, it may be caused by infectious diseases, such as tuberculosis, bacterial or viral infections, which may cause low-grade fever and palpitation fever. In addition, non-infectious diseases, such as rheumatoid immune diseases, may also have a low fever, palpitation fever symptoms, need to be clearly diagnosed for symptomatic treatment. Some patients do not have diseases, but may also have abnormal thermoregulatory function, resulting in low-grade fever and palmar fever. Some patients have persistent fever, and some patients with high and low body temperature, sometimes normal, are suffering from exchanges of cold and heat, mostly due to yin deficiency and fire exuberance. After a long period of yin deficiency, it may result in hyperactivity of yang, leading to fever, accompanied by dry mouth and tongue, heat in the palms and feet, irritability, night sweating, insomnia and other manifestations. This can be regulated by nourishing yin and clearing heat, such as Zhi Bai Di Huang Wan, which has the effect of nourishing yin and clearing heat and treating low fever. If the patient has low fever at one time and does not have low fever at another time, and is in the Shaoyang syndrome, Xiao Chaihu Tang can be used to regulate the patient.