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Medicine : hiroshi Ikushima Speaks Highly of Ear Disorders : Brain Fatigue! The author is a doctor in charge of Hideki Kuriyama, the former director of WBC Samurai Japan who was forced to retire due to Meniere disease. hiroshi Ikushima is a doctor who has great confidence in him. He has appeared in "The World's Most Wanted Class" 13 times, and is also a otolaryngologist who cares for astronauts' ears. This book shows how to prevent ear disorders such as age-related hearing loss and tinnitus, which occur to anyone as they get older, and how to protect ear health in daily life. It also explains how to deal with "hearing loss, the greatest risk of dementia," in order to prevent dementia. In fact, the major cause of ear disorders is "brain fatigue"! It introduces control methods that you can do by yourself to reduce the stress that makes your brain tired and the disturbance of the autonomic nervous system, new information about your diet, walking methods, etc.