A child vomiting after falling on the back of the head may be caused by concussion, traumatic subarachnoid hemorrhage, skull fracture and so on. 1. Concussion: after a child falls on the back of the head, concussion may occur, vomiting, transient impaired consciousness, amnesia, the patient should be bedridden, most do not need special treatment. 2. Traumatic subarachnoid hemorrhage: After a child falls on the back of the head, traumatic subarachnoid hemorrhage may also occur, causing vomiting, dizziness, nausea, headache and other uncomfortable symptoms. 3. Skull fracture: Skull fracture can also cause vomiting, headache, pressure pain at the fracture site, which can lead to vomiting after the child fell on the back of the head. The child fell after the back of the head after vomiting, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.