Reishi mushroom is used for aging, boosting the immune system; viralinfections such as the flu (influenza), swine flu, and avian flu; lung conditions including asthma and bronchitis; heart disease and contributing conditions such as high blood pressure and high cholesterol; diabetes; kidney disease; cancer; polyps (growths) in the colon or rectum, and liver disease. It is also used for HIV/AIDS, altitude sickness, symptoms in the urinary tract in men, chronic fatigue syndrome (CFS), trouble sleeping (insomnia), stomach ulcers, poisoning, and herpes pain. Other uses include reducing stress and preventing and treating different kinds of fatigue.