The diagnosis of Alice in Wonderland syndrome mainly depends on clinical symptoms. That is to say, the patient is about 3 to 10 years old and has a history of virus infection in the past few days to weeks; The patient is conscious at the onset, and there will be no encephalitis or meningitis-like symptoms such as lethargy, vomiting, severe headache, anxiety and confusion; Patients can talk to their families normally, but there will be image distortion or optical illusion, such as the portrait they see will become smaller, bigger, farther away, closer and even deformed. According to our experience and some documents, most diseases occur at night, and some people speculate that it is impossible to compare the relative size of night with the surrounding environment. It is generally believed that EB virus is the most common viral infection that causes Alice in Wonderland Syndrome, but in fact, other viral infections such as varicella virus, Zazie virus and epidemic virus can also cause the disease. Alice in Wonderland Syndrome was discovered and named as early as 1944. The main reason is that the image the patient feels is very similar to the scene in Alice in Wonderland written by lewis carroll in 1865. Before 1940s, this book was made into an animated cartoon by American Disney Company, which was very popular. It is not surprising that this disease will take a somewhat vivid and well-known name. Many diseases, such as epilepsy, encephalitis, brain tumors, and even some people's migraine, will also have symptoms of hallucinations or distorted visual images. Lewis Carrol himself said that he had been suffering from migraine for many years. It is generally believed by later generations that the grotesque characters and animals in the novel should be the works written by his vision or false vision when he was ill and rich imagination, but we should not say that lewis carroll also suffers from Alice in Wonderland Syndrome. Up to now, the research literature on Alice in Wonderland Syndrome in Taiwan Province Province belongs to an article published by 1992 in the Journal of Pediatrics of MacKay Hospital, but only 10 cases were collected during the four years from 1987 to 1990. Although no one has counted the incidence of this disease in Taiwan Province Province, it should not be small, because the course of Alice in Wonderland syndrome is mostly mild after recovery. Many parents have completely recovered from their children's overnight pain and have no intention of going to a big hospital at all. Therefore, if the child has strange words and deeds during or after catching a cold, don't doubt that the child has taken the wrong medicine, and discuss the possibility of illness with the pediatrician.