Obsessions are persistent, intrusive thoughts that are difficult or impossible to stop, often focusing on topics such as health, morality, or safety. Compulsions are repetitive behaviors or mental acts performed to reduce the distress caused by these obsessions, such as excessive hand washing, checking, or counting.

The author’s theory connects OCD to chronic stress, specifically through the action of stress-related hormones on the brain. The hormone CRH, which is released during stress, is known to activate specific receptors in the brain. In OCD, this stress pathway becomes dysregulated, involving the HCN channels, which are known to maintain continuous cellular activity. This results in repetitive neuronal activity in the prefrontal cortex, the area of the brain responsible for executive functions and decision-making.

The theory suggests that when CRH excessively activates HCN channels in the prefrontal cortex, it leads to persistent and intrusive thoughts, which are experienced as obsessions. This excessive activation creates a loop where the brain becomes ‘stuck’ on certain thoughts, amplifying them and making it difficult to move on.

Interestingly, the theory also explains the compulsive behaviors associated with OCD. These actions serve as an attempt to reduce the distress caused by obsessions, offering temporary relief but reinforcing the cycle of repetitive thoughts and actions. The compulsions themselves may be physical (e.g., washing hands) or mental (e.g., counting or silently repeating words).

The author highlights a promising potential treatment for OCD. A drug currently approved for ADHD has shown effectiveness in suppressing HCN channel activity in the prefrontal cortex. This drug could reduce the intrusive thoughts and compulsive behaviors characteristic of OCD. Despite being approved for another condition, the drug is safe for human use and could be repurposed for OCD treatment. 

The author calls on clinicians and researchers to investigate this potential treatment further by conducting systematic trials with OCD patients. They emphasize the urgency of exploring this approach, as existing treatments, such as SSRIs and cognitive behavioral therapy, are not effective for all patients and often have significant limitations.

Overall, the theory provides a novel and biologically grounded explanation for OCD, linking chronic stress, CRH activation, and HCN channels to the disorder’s symptoms. It offers hope for a new direction in treatment, focusing on the underlying biology rather than solely addressing the symptoms. This approach could significantly improve the quality of life for individuals living with OCD.