The common reasons for the patient’s head to become larger are as follows: 1, intracranial occupying lesions: such as intracranial tumors or hydrocephalus. 2, intracranial infectious diseases: such as meningitis, it is best to go to a specialist hospital and check the cranial CT to determine the diagnosis. 3, increased intracranial pressure in infants and young children: if the bone suture is not closed in infants and young children, when the intracranial pressure is increased, the head can also occur compensatory enlargement, the main reason for the enlargement is The main reason for the enlargement is the increase in intracranial pressure, which causes progressive abnormal enlargement of the head. 4, too much vitamin D supplementation: there is another cause of oversized head in children, which may be caused by too much vitamin D supplementation, which can be detected by checking the bone density in the hospital and checking other causes, and the best way to detect it is also to do cranial CT. if necessary, growth hormone and cranial MRI can also be checked to clarify the diagnosis.