Anxiety Disorders
This is a follow up to my post on OCD and idolatry. In Christian circles, it's not unusual to hear that anxiety is a sign of idolatry. The intolerance of uncertainty, which is a common symptom in many anxiety disorders, is also labeled as idolatry. This is not helpful because people who have anxiety disorders often have a serotonin deficiency.
For people with anxiety disorders, the problem isn't the fallen human heart. The problem is the deficiency of a neurotransmitter in the human brain. This deficiency, among other neurological factors, is why it's so difficult for individuals with OCD to not carry out compulsions, even when they know they shouldn't engage in compulsions.