A body temperature of 37.5°C in the armpit is definitely not normal for this condition. The armpit is one of the most commonly used parts of the body to measure body temperature, it is more convenient and easy to use, and also more hygienic and safe. Generally speaking, the normal range of body temperature under the armpit should be between 36-37.3℃, more than 37.3℃ body temperature is definitely abnormal, obviously 37.5℃ has exceeded 37.3℃, this is a state of hypothermia. There are many reasons for high body temperature, of course, the most common is often said to be infectious fever, such as colds, or like pneumonia, bronchitis, etc. Of course, patients will also have some other symptoms, such as a runny nose, nasal congestion, or a cough, sore throat, and so on. In addition to infectious, there are also non-infectious fevers, such as autoimmune disease, rheumatoid arthritis or dermatomyositis, and lupus can also cause fever, and the specific situation needs to be determined by taking into account the patient’s symptoms.