Encephalitis is mainly differentiated from gastrointestinal colds and common gastroenteritis. Because vomiting can occur in gastroenteritis, it is easier to diagnose encephalitis because of the difficulty in eating after vomiting, which can lead to poor mental health, and there may be fever. However, in the gastrointestinal form of vomiting, there is often a history of abdominal pain or ingestion of unclean food. It is also important to differentiate from diseases that cause headaches, such as migraine or paranasal sinusitis or vasoneurotic headaches, which may cause headaches and are easily diagnosed as encephalitis. Migraine usually has a chronic onset, but tuberculous encephalitis or cryptococcal encephalitis also has a chronic onset, so the headache needs to be identified by inpatient imaging and cerebral hemogram, which cannot be identified by outpatient physician visits.