CFIDS

CFIDS (pronounced "cee-fids") is short for Chronic Fatigue Immune Dysfunction Syndrome, the name often used in the 1990s by patients and physicians. This name was never adopted by the different health agencies of the US government, as they used chronic fatigue syndrome (CFS).

Some organizations started in the 1990s continue to use CFIDS in their names. However, in 2018, the Massachusetts CFIDS/ME & FM Association changed its name to the Massachusetts ME/CFS & FM Association.