Body temperature of 35.8 ℃ is not low immunity. Body temperature 35.8 ℃ belongs to hypothermia. There are many reasons for hypothermia, which are generally considered to be caused by being in a cold environment, applying overdose of antipyretic drugs, hypothyroidism, and so on. It may also be related to individual differences. 1. Being in a cold environment: If you don’t add clothes in time when the weather is cold, or if you stay in a cold environment for a long time because of your work, you may have hypothermia, which can be recovered by keeping warm and drinking more warm water. 2. Application of fever-reducing drugs overdose: for example, when the human body does not apply fever-reducing drugs according to the dose is too large, or mistakenly take fever-reducing drugs can cause hypothermia. 3. Hypothyroidism: It is a generalized low metabolic syndrome caused by insufficient production of thyroid hormone or weakened action of thyroid hormone due to various reasons. Hypothermia can occur, accompanied by weakness, slow heart rate, loss of appetite and other symptoms. In addition, it may be related to individual differences. If the body temperature is 35.8 for a long time without any other discomfort, it may be due to individual differences. Hypothermia with discomfort needs to go to the hospital, a clear diagnosis of the cause of the disease for targeted treatment, you can not randomly use drugs.