The<unk>  is a grouping of related psychiatric and medical disorders which may accompany bipolar, unipolar, and schizoaffective disorders at statistically higher rates than would normally be expected.  These disorders are identified by a common positive response to the same types of pharmacologic treatments. They also aggregate strongly in families and may therefore share common heritable underlying physiologic anomalies.<unk>  disorders include:
Attention-deficit hyperactivity disorder
Bipolar disorder
Body dysmorphic disorder
Bulimia nervosa and other eating disorders
Cataplexy
Dysthymia
General anxiety disorder
Hypersexuality
Impulse-control disorders
Kleptomania
Migraine[citation needed]
Major Depressive Disorder
Narcolepsy[citation needed]
Obsessive-compulsive disorder
Panic disorder
Posttraumatic stress disorder
Premenstrual dysphoric disorder[citation needed]
Social phobia
The following may also be part of the<unk>  accompanying<unk>  disorders[citation needed].
Chronic pain
Intermittent explosive disorder
Pathological gambling
Personality disorder
Pyromania
Substance abuse and addiction (includes alcoholism)
Trichotillomania
Also, there are now studies linking heart disease[citation needed].
Please note that many of the terms above overlap.  The generally accepted definition of these terms can be found in the Diagnostic and Statistical Manual of Mental Disorders (DSM).
Affective spectrum
Dominance relationship
Multistable perception
Relative volatility
Itch pathophysiology
Impaction
Affect display
Valence 