Other causes	Common examples
Toxic metabolic	Alcohol, diabetes, systemic infections (influenza, tuberculosis, malaria), hyponatraemia, hypokalaemia, hypocalcaemia, hypocapnia, uraemia
Drugs	Opioids, diazepam, barbiturates, dexamethasone, alpha-methyldopa, dopamine agonist and chemotherapeutic agents
Psychogenic	Anorexia, anxiety, stress, schizophrenia