| A | B |
| psychiatry | branch of medicine that deals with the diagnosis, treatment, and prevention of mental illness |
| psychiatrist | medical doctor who treats mental illness (can prescribe) |
| clinical psychologist | nonmedical doctor who treats mental illness (does not prescribe) |
| amnesia | loss of memory |
| anxiety | feeling of uneasiness, apprehension, or dread |
| apathy | absence of emotions; lack of interest or emotional involvement or motivation |
| compulsion | uncontrollable urge to perform an act repeatedly |
| conversion | symptom that occurs when anxiety becomes a physical symptom that has no physical cause |
| delusion | fixed, false belief that cannot be changed by logical reasoning or evidence |
| dissociation | uncomfortable thoughts are split off from the person's unconscious awareness to avoid mental distress |
| dysphoria | sadness, hopelessness, depressive mood |
| euphoria | exaggerated feeling of well-being |
| hallucination | false sensory perception |
| illusion | false perception of a real sensory stimulus |
| labile | unstable or variable; undergoing rapid emotional change |
| mania | elevated, excitable state with euphoria, hyperactivity and delusions |
| mutism | no, or very little, ability to talk |
| obsession | involuntary, persistent idea or emotion |
| paranoia | overly suspicious thinking; fixed delusion of being harassed or persecuted |
| anxiety disorders | group of disorders characterized by anxiety or fear out of proportion to the real danger in a situation |
| obsessive-compulsive disorder | presence of obsession and/or compulsions that consume time or cause distress or impairment of functioning |
| dissociative disorders | group of disorders characterized by impairment of memory, identity, emotion, perception, behaviour and/or sense of self |
| neurodevelopmental disorders | developmental deficits that produce impairments of personal, social, academic or occupational functioning |
| personality disorders | conditions of a pattern of inner experience and behaviour that deviates markedly from the expectation of the individual's culture |
| attention deficit hyperactivity disorder | problem with inattentiveness, over-activity and/or impulsivity out of normal range for a child's age and development |
| autism spectrum disorder | group of conditions manifested by deficits in social communications or interactions and restricted, repetitive patterns of behaviour, interests or activity |
| schizophrenia and psychotic disorders | conditions defined by abnormalities in one or more domains including delusions, hallucinations, disorganized thinking or speech, disorganized motor behaviour or negative symptoms |
| somatic symptom disorders | conditions involving physical symptoms that disrupt normal functioning and dominate the individual's thoughts, feelings and behaviours |
| substance-use and addictive disorders | pathological behavioural changes associated with regular use or discontinuation of substances that affect the CNS |
| psychotherapy | treatment of emotional problems and disorders using psychological techniques |
| feeding and eating disorders | conditions characterized by persistent disturbance of eating or eating-related behaviour |
| enuresis | repeated voiding of urine into inappropriate places |
| encopresis | repeated passage of feces into inappropriate places |
| depressive disorders | conditions characterized by presence of sad, empty, or irritable mood, accompanied by physical and mental changes |
| bipolar disorders | characterized by the occurrence of manic or hypomanic episodes which may or may not alternate with depressive episodes |
| gender dysphoria | condition involving a difference between one's experienced / expressed gender and assigned gender that causes significant distress or problems functioning |
| delirium | acute, temporary disturbance of cognition |
| major neurocognitive disorder | observable cognitive decline in one or more domain (dementia) |
| paraphilic disorders | intense and persistent sexual interest outside of foreplay and genital stimulation with consenting adults |
| sexual dysfunctions | clinically significant disturbances in sexual desire or changes in sexual response |
| electroconvulsive therapy (ECT) | application of electrical current to the brain while the patient is anesthetized |
| trauma and stress-related disorders | conditions caused by exposure to a traumatic or stressful event |
| elimination disorders | inappropriate elimination of urine or feces |
| sleep-wake disorders | conditions characterized by disturbed sleep causing distress as well as impairment in daytime functioning |
| disruptive and impulse control disorders | conditions that involve problems in the self-control of emotions and behaviours; manifests in behaviours that violate the rights of others or cause conflict |