Idiopathic chronic fatigue (ICF) or chronic idiopathic fatigue or insufficient/idiopathic fatigue[3] is a term used for cases of unexplained fatigue that have lasted at least six consecutive months[1] and which do not meet the criteria for myalgic encephalomyelitis/chronic fatigue syndrome.[4] Such fatigue is widely understood to have a profound effect on the lives of patients who experience it.[1][5]
^Kim, Tae-Hun; Kim, Do-Hoon; Kang, Jung Won (2020-04-01). "Medicinal herbs for managing fatigue symptoms in patients with idiopathic chronic fatigue: A PRISMA compliant updated systematic review and meta-analysis of randomized controlled trials based on the GRADE approach". European Journal of Integrative Medicine. 35: 101069. doi:10.1016/j.eujim.2020.101069. ISSN1876-3820. S2CID214256657.