Genetics/biology. A particular neurological deficit will cause multiple 'disorders'. All bipolar is not the same and all OCD is not the same. It's better to think of it as particular combinations of genes that cause different neurological deficits. Each deficit will cause a constellation of different symptoms/disorders.
I'm one of those who is hit with the whole gamut of comorbidities. It's just a sign that my neurobiology is off in significant, widespread ways that seems to elicit a whole range of symptomology. I have a whole 'syndrome' rather than a bunch of different disorders.
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age: 23
dx: bipolar I, ADHD-C, tourette's syndrome, OCD, trichotillomania, GAD, Social Phobia, BPD, RLS
current meds: depakote (divalproex sodium) 1000mg, abilify (aripiprazole) 4mg, cymbalta (duloxetine) 60mg, dexedrine (dexamphetamine) 35mg, ativan (lorazepam) 1mg prn, iron supplements
past meds: ritalin, adderall, risperdal, geodon, paxil, celexa, zoloft
other: individual talk therapy, CBT, group therapy, couple's therapy, hypnosis
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