Mushrooms have a history of medicinal use that goes back thousands of years. Today, thanks to centuries of traditional use and modern scientific research, these amazing species are well understood, and many have been found effective in treating modern health conditions. This book highlights 40 species of mushrooms that have shown significant benefit for chronic illness, including autoimmune conditions. Color images of each species aid the reader in identifying the featured mushrooms, and notes on additional species clearly inform -- or warn -- the reader of similar-looking mushrooms. Medicinal mushroom species are known alternatives to conventional medicine, and/or treatments complementary with allopathic (modern) medicine. This clear, concise book highlights interesting recent research, suggesting promising new approaches to a variety of chronic health issues.