Another way to look at OCD is from a biological perspective, which looks at a person's genetics, biochemistry, and brain structure to find a reason why a person acts that way and develops OCD. Genetic studies have demonstrated that biological and environmental factors are important for the development of OCD. No specific OCD gene has yet been identified. Twin studies have confirmed that there is a genetic component to the cause of OCD. Many researchers have found that in twin studies, monozygotic twins are more concordant with OCD than dizygotic twins. The higher concordance in monozygotic twins than in dizygotic twins implies that there is some type of genetic inheritance. The fact that the concordance rate in monozygotic twins is not 100% indicates that environmental factors may also have an influence on the development of OCD. Studies have also shown that OCD also runs in families and is hereditary. Families of someone diagnosed with OCD are at higher risk of developing OCD and tics, which are repetitive movements and sounds, than the general population. Studies have proven that parents, siblings, and children of someone with OCD are at higher risk of developing OCD than those who do not have a family history of the disorder, but this may not be the case. 'be accurate only for certain types of OCD. For example, family factors include age of onset, that is, childhood-onset OCD tends to run in families, and family history of tic-related disorders like tic disorder of Tourette's. Tourette's disorder is a disorder that causes a person to make repetitive movements and sounds that they cannot control. Phobia readiness theory is a concept developed to explain why specific connections with objects are learned...... middle of paper ... ...after infection. The infection itself does not cause OCD, but does cause OCD symptoms in children who have a genetic tendency to develop it. Treatment: There are three possible ways to treat OCD: psychotherapy, CBT, and medication. When it comes to medications, serotonin reuptake inhibitors (SRIs) have been found to be effective in treating OCD, which increases the level of serotonin in the brain. SRIs belong to a group of medications called antidepressants. Antidepressants include: clomipramine, fluoxetine, fluvoxamine, paroxetine and sertraline. Clomipramine is very different from other antidepressants because other antidepressants primarily affect only serotonin and are called selective serotonin reuptake inhibitors (SSRIs). However, clomipramine affects other neurotransmitters, causing more side effects than SSRIs. And that's why doctors prescribe SSRIs first.