DSM-IV diagnostic criteria for schizoid personality disorder:
A. A pervasive pattern of detachment from social relationships and a restricted range of expression of emotions in interpersonal settings, beginning by early adulthood and present in a variety of contexts, as indicated by four (or more) of the following:
1. neither desires nor enjoys close relationships, including being part of a family
2. almost always chooses solitary activities
3. has little, if any, interest in having sexual experiences with another person
4. takes pleasure in few, if any, activities
5. lacks close friends or confidants other than first-degree relatives
6. appears indifferent to the praise or criticism of others
7. shows emotional coldness, detachment, or flattened affectivity
B. Does not occur exclusively during the course of Schizophrenia, a Mood Disorder With Psychotic Features, another Psychotic Disorder, or a Pervasive Developmental Disorder and is not due to the direct physiological effects of a general medical condition.
Associated features: Odd/Eccentric/Suspicious Personality
Note: If criteria are met prior to the onset of Schizophrenia, add "Premorbid," e.g., "Schizoid Personality Disorder (Premorbid)."
Description from ICD-10:
Personality disorder characterized by at least 3 of the following:
(a) few, if any, activities, provide pleasure;
(b) emotional coldness, detachment or flattened affectivity;
(c) limited capacity to express either warm, tender feelings or anger towards others;
(d) apparent indifference to either praise or criticism;
(e) little interest in having sexual experiences with another person (taking into account age);
(f) almost invariable preference for solitary activities;
(g) excessive preoccupation with fantasy and introspection;
(h) lack of close friends or confiding relationships (or having only one) and of desire for such relationships;
(i) marked insensitivity to prevailing social norms and conventions.
Excludes:
- Asperger's syndrome
- delusional disorder
- schizoid disorder of childhood
- schizophrenia
- schizotypal disorder
Use of cannabis and LSD is quite common as self-medication.