Myalgic encephalomyelitis (my-AL-gic en-SEH-fuhlow-MY-uh-LIE-tus)/chronic fatigue syndrome (ME/CFS) is a chronic, severe, possibly disabling disorder. It can cause inflammatory, neurologic, immune, and metabolic problems that are not well understood. More at https://www.aafp.org/pubs/afp/issue...gic-encephalomyelitis-chronic-fatigue-sy.html