A Hong Kong psychiatric hospital has appealed to the public to help find a patient who went missing on Wednesday. The 28-year-old man was said to have left Castle Peak Hospital, Tuen Mun, without approval while going from one building to another on the premises. Staff noticed he was missing at about 2.40pm. A review of security footage showed he had left the premises, a spokesman for the Hospital Authority said. The patient had previously been admitted for a mental condition, which had improved after treatment. He was undergoing psychiatric rehabilitation. Simulation in Hong Kong hospital will let people experience how disruptive mental illness can be Security guards searched the whole site but could not find him. Police and the patient’s family were alerted. Dr Ting Sik-chuen, a specialist in psychiatry, said most patients at Castle Peak were in open wards, and were free to move about within the premises. Patients undergoing rehabilitation at the hospital or other mental facilities are entitled to apply for leave. Applications are supposed to be reviewed within 72 hours. Why mental health awareness should start in Hong Kong schools and companies Patients who discharge themselves against medical advice are usually found at home, Ting said. “What’s worrying is that the patient might be running out of medicine … which could lead to a relapse. It will not happen immediately, but the risk will be higher two weeks after stopping the medication,” he said, adding that the patient’s family should encourage him to go back to his doctors. When he left, the patient was wearing a black overcoat, dark trousers and glasses. He is about 174cm tall, of medium build and has black hair. The hospital appealed to the public to contact the police New Territories North Regional Missing Person Unit at 6273 5787, or call the hospital at 2456 7111 if they have information about his whereabouts.