First, the causes of the onset are different. Heat stroke is caused by working and living in a high temperature and high humidity environment for a long time, while fever is usually caused by viral or bacterial infections, or other inflammatory diseases on the body that cause fever. Second, the difference in symptoms, heat stroke does not necessarily appear fever, if it is a precursor heat stroke there may be no fever. In addition, fever is only present if the heat stroke is mild or severe. Heat stroke is also accompanied by symptoms such as dizziness, headache, nausea, vomiting or lack of concentration and attention. Fever is usually accompanied by symptoms of upper respiratory tract infection, including stuffy nose and runny throat, sore throat, sneezing and so on. Third, the treatment method is also different, heat stroke if it is aura heat stroke or mild heat stroke, you can quickly replenish fluids or drink some light saline and pay attention to rest, usually the symptoms will gradually ease. If it is fever, fever is relatively high, must be given antipyretic treatment. The most important thing is to treat the primary disease, bacterial infections must be treated with antibiotics. In the case of viral infection, if it is influenza A, antiviral drugs must be applied.