* Can be associated with Heavy metal toxicity (See [[Detox]])
* Can be associated with low blood pressure ([[Hypotension]])
* Can be associated with low blood sugar ([[Hypoglycemia]])
* Chronic depression is associated with a variety of nutrient deficiencies, including that of vitamin B6, vitamin B12,vitamin D, folate [[Vitamin B9]], choline, protein, and omega-3 fatty acids.