10Meaning of mental illness

10 Meaning of mental illness mental illness means a condition that seriously impairs (either temporarily or permanently) the mental functioning of a person in 1 or more areas of thought, mood, volition, perception, orientation or memory, and is characterised by— (a) the presence of at least 1 of the following symptoms: (i) delusions; (ii) hallucinations; (iii) serious disorders of streams of thought; (iv) serious disorders of thought form; (v) serious disturbance of mood; or (b) sustained or repeated irrational behaviour that may be taken to indicate the presence of at least 1 of the symptoms mentioned in paragraph (a).