Table 1. Rare causes of fatigue (usually accompanied by other symptoms) (5).

Type of disease	Rare causes of fatigue
Endocrine	● Addison’s disesase (e27) ● Conn syndrome/Cushing syndrome (e28) ● pituitary deficiency (e29)
Metabolic	● Gilbert’s disease ● hypercalcemia (e30, e31)
Infectious	● tuberculosis ● toxoplasmosis ● brucellosis ● malaria, other tropical diseases ● AIDS, borreliosis/Lyme disease (e32)
Inflammatory	● systemic lupus erythematosus (e33)
Cardiac	● endocarditis
Neurological	● brain tumor (e34) ● multiple sclerosis (e35) ● prior head injury (e36)
Psychiatric	● schizophrenia (e37)