- Other mental health conditions: Anxiety d/o, ETOH and other substance abuse, withdrawal from substances of abuse
- Co-mingling w/other medical conditions, including: parkinson's, alzheimers, multiple sclerosis, advanced CHF, traumatic brain injury, hypothyroidism, adrenal excess
- Many meds, including: interferon, anabolic steroids when cycle off, beta blockers, clonidine, other→ w/dx based on temporal connection