Delirium is a acute syndrome of disorientation caused by dysfunction of brain tissue and has a many varied symtome. It is characteristic of consciousness distrubance with disorientation and dys-mnesia and emotional distrubance. We experienced a 66 year-old man who had a hydrocephalus and hypertension as well as Delirium caused by cranial trauma, and whose condition was improved through Oriental medical treatment. This case study illustrates what the manifestation of Delirium caused by cranial trauma and drug abuse etc. is and how Delirium improved.