A wide range of conditions that affect mood, thinking and behavior. Most common types Clinical depression A mental health disorder characterised by persistently depressed mood or loss of interest in activities, causing significant impairment in daily life. Anxiety disorder A mental health disorder characterised by feelings of worry, anxiety or fear that are strong enough to interfere with one's daily activities. Bipolar disorder A disorder associated with episodes of mood swings ranging from depressive lows to manic highs. Dementia A group of thinking and social symptoms that interferes with daily functioning. Attention-deficit/hyperactivity disorder A chronic condition including attention difficulty, hyperactivity and impulsiveness. Schizophrenia A disorder that affects a person's ability to think, feel and behave clearly. Obsessive compulsive disorder Excessive thoughts (obsessions) that lead to repetitive behaviours (compulsion...