Eating disorders are psychological conditions characterized by abnormal or disturbed eating habits. Anorexia nervosa involves severe restriction of food intake, while bulimia nervosa involves cycles of binge eating followed by compensatory behaviors. Both are recognized clinical diagnoses within the DSM-5, whereas metabolic rate is a physiological process rather than a disorder.

Epidemiological studies consistently show that eating disorders, such as anorexia nervosa and bulimia nervosa, are significantly more prevalent in females than in males. Estimates often place the female representation at 90% to 95% of clinical cases, reflecting strong sociocultural and biological influences that disproportionately affect women regarding body image and weight-related psychological distress.

Paraphilias involve intense and persistent sexual interests other than sexual interest in genital stimulation or preparatory fondling with phenotypically normal, physically mature, consenting human partners. In clinical diagnostic manuals like the DSM, these are categorized under sexual disorders or paraphilic disorders, reflecting the atypical nature of the sexual arousal patterns involved.

Modern legal definitions of rape have evolved significantly to be more inclusive of various forms of non-consensual sexual violence. Many jurisdictions now define rape as the penetration, however slight, of the vagina or anus with any body part or object, or oral penetration by a sex organ of another person, without the consent of the victim. This broader definition reflects a growing recognition of the severe psychological and physical trauma associated with all forms of forced sexual contact.

Eating disorders are complex conditions influenced by a multifaceted interplay of psychological, biological, and sociocultural factors. Psychological causes, such as low self-esteem, perfectionism, and body image dissatisfaction, are foundational contributors to the onset and maintenance of these disorders.

Eating disorders are complex conditions influenced by a combination of biological, social, and psychological factors. Psychological contributors include low self-esteem, which may lead to a need for control, and perfectionism, which can manifest as rigid dietary habits. Additionally, distorted perceptions of body image and self-worth are central to the maintenance of these disorders, making them multifaceted psychological challenges.

Seasonal affective disorder (SAD) is a type of depression that occurs at the same time each year, typically starting in the fall and continuing into the winter months. Clinical estimates suggest that approximately 5% of the adult population in the United States experiences this condition. While many people experience minor mood fluctuations during seasonal changes, SAD is a distinct clinical diagnosis that significantly impacts daily functioning for this smaller subset of the population.

In schizophrenia, 'positive' symptoms refer to an excess or distortion of normal functions, such as hallucinations or delusions. Conversely, 'negative' symptoms represent a loss or decrease in normal functions, such as affective flattening, alogia, or social withdrawal.

Depression is widely recognized as the most common mood disorder. In clinical settings, major depressive disorder is significantly more prevalent than bipolar disorders (formerly manic-depression) or isolated manic episodes. It is characterized by persistent sadness, loss of interest, and impairment in daily functioning, making it a primary focus in the study of mood-related psychopathology.

MAO inhibitors, tricyclics, and Selective Serotonin Reuptake Inhibitors (SSRIs) are all categories of antidepressant medications. They function by altering the levels of neurotransmitters like serotonin, norepinephrine, or dopamine in the brain to alleviate the symptoms of clinical depression and related mood disorders.