| cyclothymic personality disorder | A personality disorder in which a person experiences regularly alternating periods of elation and depression, (see bipolar illness) usually not related to external circumstances or situation. (27 Sep 1997) |
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| Hartnup disorder | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| heat stress disorder | A group of conditions due to overexposure to or overexertion in excess environmental temperature. It includes heat cramps, which are non-emergent and treated by salt replacement; heat exhaustion, which is more serious, treated with fluid and salt replacement; and heatstroke, a condition most commonly affecting extremes of age, especially the elderly, accompanied by convulsions, delusions, or coma and treated with cooling the body and replacement of fluids and salts. (12 Dec 1998) |
| schizoid personality disorder | An individual who is isolated, cold and indifferent. (27 Sep 1997) |
| schizophreniform disorder | A disorder whose essential features are identical with those of schizophrenia, with the exception that the duration including prodromal, active, and residual phases is less than six months. (05 Mar 2000) |
| schizotypal personality disorder | An individual who is eccentric with ideas, reference, magical thinking and suspicious. (27 Sep 1997) |
| psychogenic pain disorder | A disorder in which the principal complaint is pain that is out of proportion to objective findings and that is related to psychological factors. (05 Mar 2000) |
| seasonal affective disorder | A syndrome characterised by depressions that recur annually at the same time each year, usually during the winter months. Other symptoms include anxiety, irritability, decreased energy, increased appetite (carbohydrate cravings), increased duration of sleep, and weight gain. Sad (seasonal affective disorder) can be treated by daily exposure to bright artificial lights (phototherapy), during the season of recurrence. (12 Dec 1998) |
| histrionic personality disorder | An individual who is dramatic, engaging, self-centreed and attention seeking. (27 Sep 1997) |
| psychosomatic disorder | A disorder characterised by physical symptoms of psychic origin, usually involving a single organ system innervated by the autonomic nervous system; physiological and organic changes stem from a sustained disturbance. (05 Mar 2000) |
| separation anxiety disorder | A mental disorder occurring in childhood characterised by excessive anxiety when the child is separated from someone to whom the child is attached, usually a parent. (05 Mar 2000) |
| shared paranoid disorder | A condition in which two closely related persons, usually in the same family, share the same delusions. (12 Dec 1998) |
| shared psychotic disorder | Identical or similar mental disorders, such as a paranoid fixation, usually affecting two members of the same family living together. Synonym: shared psychotic disorder. Origin: Fr. Two (05 Mar 2000) |
| single gene disorder | Hereditary disorder caused by a mutant allele of a single gene (for example, Duchenne muscular dystrophy, retinoblastoma, sickle cell disease). Compare: polygenic disorders. (09 Oct 1997) |
| somatisation disorder | A psychological disorder where there are multiple physical complaints that suggest physical disorders without any physical impairment to account for them. Gastrointestinal symptoms and pain syndromes are the most common features. (27 Sep 1997) |