<unk> s are characterized by ambiguous, non-specific symptoms that appear in otherwise-healthy people. Overlap in symptomology exists across diagnoses, including gastrointestinal issues, pain, fatigue, cognitive difficulties, and sleep difficulties. Some have proposed to group symptoms into clusters or into one general<unk><unk>  disorder given the finding of correlations between symptoms and underlying etiologies.
Functional somatic syndrome
Nociplastic pain
Medication phobia
Paroxysmal extreme pain disorder
Factitious disorder
Somatic symptom disorder
Benzodiazepine dependence
Caffeine-induced anxiety disorder