The patient in this scenario is experiencing typical symptoms of Concussion syndrome/ Mild brain injury. Patient may also have blurring of vision or brief period of amnesia. Such cases have good prognosis with little chance of deterioration. Persistent severe headache and repeated vomiting in the context of normal aleness and no focal neurological signs is usually benign, but CT should be obtained and a longer period of observation is appropriate. If the impact is severe,the patient will be having:- Persistent confusion Repeated vomiting Palpable skull fracture Any other serious bodily injuries,etc. Note- Lucid interval (Consciousness between two periods of unconsciousness) is characteristic of extradural haemorrhage in which lentiform opacity is seen on NCCT head