Fear of heights is not a common obsession in OCD. Common obsessions include fear of contamination, fear of harm to oneself or others, fear of making mistakes, and intrusive thoughts of a sexual or violent nature.

Hoarding is not a common compulsion in OCD. Common compulsions include excessive handwashing, checking and rechecking things, counting, and repeating certain actions or words.

The primary difference between OCD and OCPD is that OCD is characterized by obsessions and compulsions, while OCPD is characterized by perfectionism and orderliness. OCD is also characterized by anxiety and distress, while OCPD is characterized by rigidity and inflexibility.

Substance use disorders are not a common comorbid condition with OCD. Common comorbid conditions include depression, anxiety disorders, and eating disorders.

The basal ganglia is thought to be primarily involved in the pathophysiology of OCD. The basal ganglia is a group of structures located deep within the brain that is involved in motor control, reward processing, and habit formation.

Serotonin is thought to be primarily involved in the pathophysiology of OCD. Serotonin is a neurotransmitter that is involved in mood regulation, sleep, and appetite.

Selective serotonin reuptake inhibitors (SSRIs) are commonly used to treat OCD. SSRIs are a type of antidepressant that increases the levels of serotonin in the brain.

Exposure and response prevention (ERP) is commonly used to treat OCD. ERP is a type of behavioral therapy that involves gradually exposing the person to the things they fear and teaching them how to resist the urge to engage in compulsive behaviors.

The typical age of onset for OCD is childhood or early adolescence. However, OCD can also develop in late adolescence, early adulthood, or even later in life.

The prognosis for OCD is generally good with treatment. Most people with OCD can manage their symptoms and live full and productive lives.

Avoiding social situations due to fear of being judged is not a common symptom of BDD. Common symptoms include preoccupation with a perceived flaw in one's appearance, excessive grooming or mirror checking, and repeatedly seeking reassurance about one's appearance.

Substance use disorders are not a common comorbid condition with BDD. Common comorbid conditions include depression, anxiety disorders, and eating disorders.

The frontal lobe is thought to be primarily involved in the pathophysiology of BDD. The frontal lobe is involved in decision-making, problem-solving, and social cognition.

Serotonin is thought to be primarily involved in the pathophysiology of BDD. Serotonin is a neurotransmitter that is involved in mood regulation, sleep, and appetite.

Selective serotonin reuptake inhibitors (SSRIs) are commonly used to treat BDD. SSRIs are a type of antidepressant that increases the levels of serotonin in the brain.