OCD is defined by the presence of obsessions and compulsions. Scrupulosity, checking, and repeating are common manifestations of these symptoms. While major depression is a common comorbidity—meaning it frequently occurs alongside OCD—it is a separate clinical diagnosis. Therefore, depression is not a defining symptom of the OCD pathology itself, but rather a potential secondary effect of living with the disorder.

In Obsessive-Compulsive Disorder (OCD), 'obsessions' are intrusive, unwanted thoughts that cause significant anxiety. 'Compulsions' are the repetitive, ritualistic behaviors performed in an attempt to neutralize or reduce the distress caused by those obsessions. The cycle of performing the compulsion provides temporary relief from the anxiety generated by the obsession.

In the context of OCD, 'obsessions' are defined as recurrent and persistent thoughts, urges, or images that are experienced as intrusive and unwanted. These thoughts typically cause marked anxiety or distress. They are distinct from 'compulsions,' which are the repetitive behaviors or mental acts that an individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly.

Dyspareunia, vaginismus, and premature ejaculation are recognized sexual dysfunctions. Creatinuria refers to the presence of creatine in the urine, which is a physiological or metabolic condition, not a psychological sexual disorder.

Dental problems in individuals with eating disorders are often a consequence of purging behaviors, such as self-induced vomiting. The stomach acid brought up during vomiting is highly corrosive and can rapidly erode tooth enamel. While nutritional deficiencies can weaken overall dental health, the direct physical damage to teeth is most commonly attributed to the acidity associated with purging.

While autism spectrum disorder involves complex neurological differences, 'brain lesions' are not a defining diagnostic characteristic or a standard symptom of the condition. Autism is primarily diagnosed based on behavioral patterns, including social communication deficits, repetitive behaviors, and restricted interests, rather than the presence of localized brain damage or lesions.

The Canadian Mental Health Survey primarily focuses on psychiatric and psychological disorders such as depression, anxiety, and substance abuse. Obesity is generally classified as a physical health condition or metabolic disorder rather than a mental health disorder, although it may have psychological correlates.

While specific statistics on overeating can vary based on the definition of clinical obesity or binge eating disorder, this question refers to historical estimates often cited in introductory health psychology textbooks regarding the prevalence of eating-related concerns in the U.S. population.

Both anorexia nervosa and bulimia nervosa are characterized by disordered eating patterns where food intake is driven by psychological and emotional states rather than physiological hunger or satiety signals. While other factors like body image distortion are common in both, the fundamental disruption of the hunger-satiety mechanism due to emotional regulation issues is a core shared feature of these eating disorders.

Hypoactive sexual desire disorder is characterized by a persistent or recurrent deficiency or absence of sexual fantasies and desire for sexual activity, which causes marked distress or interpersonal difficulty. It is a clinical diagnosis focused on the lack of interest, rather than the presence of paraphilic behaviors or hypersexuality.