37.7℃ is considered fever, which is low fever. Fever is defined as an increase in body temperature beyond the normal range when the body is under the action of a thermogenic source or when the dysfunction of the thermoregulatory center is caused by various reasons. The normal axillary body temperature of the human body is: 36-37°C, low fever body temperature is 37.3-38°C; moderate fever body temperature is 38.1-39°C; high fever body temperature is 39.1-41°C, and super-high fever body temperature is >41°C. 37.7°C belongs to the state of low fever, and can be treated with physical cooling methods (e.g., using antipyretic patches, warm water baths, drinking plenty of hot water, etc.) to reduce fever. There are many causes of fever in adults. The most common causes are due to infectious diseases, such as colds, urinary tract infections or gastroenteritis. If the temperature exceeds 38°C, and the symptoms cannot be relieved in time after physical cooling or other symptoms (such as convulsions, nausea, vomiting, etc.) appear, you should seek medical treatment in time to find out the cause of fever and diagnose and treat it in time, so as not to delay the condition.