Dr. Huang Diding, Director of the Pediatric Neurosurgery Department at Rong General Hospital, said that this boy often laughed since he was 2 or 3 years old. Now, his parents finally understand that it's not because their boy is born to laugh, but due to a developmental abnormality in the hypothalamus, which causes him to laugh incessantly. His laughter has nothing to do with his emotions or whether there are funny people or things around him. However, if you're not an expert, there's no way you could tell. Dr. Huang Diding also mentioned that the boy underwent surgery in February this year.