Affective disorder, e.g. depression
Symptoms must be present for 2 consecutive weeks for a diagnosis to be valid
They include a depressed mood, sadness, emptiness for most or all of the day, everyday, loss of interest in previously enjoyed activities, weight loss or gain, insomnia, inability to relax, excessive lethargy, energy loss, feelings of worthlessness or guilt, loss of concentration, thoughts of death/suicide
It affects 1/5 of the population
Psychiatric disorder, e.g. schizophrenia
Symptoms must be present for 1 month at least to be valid
Positive symptoms = new behaviours
Negative symptoms = loss of normal functions
1/100 people dianosed
Symptoms include delusions, hallucinations, disorganised speech, catatonic behaviour and reduced emotion
Anxiety disorders, e.g. specific phobias
Phobic stimulus = immediate fear/anxiety and avoidance of the stimulus
Anxiety or fear is very disproportionate to real danger
Distress is persistent for 6 months and more
Causes significant distress and impairment of areas in functioning, e.g. social life or work or education