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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

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Accession:HP:0012378 term browser browse the term
Definition:A subjective feeling of tiredness characterized by a lack of energy and motivation.
Comment:Fatigue is distinct from muscle weakness.
Synonyms:exact_synonym: Tired;   Tiredness
 xref: MESH:D005221;   SNOMEDCT_US:248274002;   SNOMEDCT_US:84229001;   UMLS:C0015672

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  Human phenotype 0
    Phenotypic abnormality 0
      Constitutional symptom 0
        Fatigue 0
          Chronic fatigue 0
          Cognitive fatigue 0
          Episodic fatigue 0
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