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Psychological disorders are defined by the American Psychiatric Association (APA) through four main criteria: significant disturbances in thoughts, feelings, or behaviors; underlying biological, psychological, or developmental dysfunction; resultant distress or disability; and a lack of culturally approved responses.Schizotypal individuals exhibit eccentric behaviors and suspiciousness.The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) serves as the authoritative classification system, outlining disorders, diagnostic features, symptoms, prevalence, risk factors, and comorbidity.Genetic vulnerability combined with environmental stress is essential for the development of schizophrenia, alongside the dopamine hypothesis, which posits that excess dopamine contributes to the disorder.Obsessive-Compulsive Disorder (OCD) involves intrusive and unwanted thoughts (obsessions) and a compulsion to perform repetitive actions or mental tasks.Major Depressive Disorder is marked by persistent sadness or diminished interest in activities, alongside weight changes, sleep issues, fatigue, feelings of guilt or worthlessness, and suicidal thoughts.Seasonal affective disorder manifests as major depressive symptoms tied to specific seasons, while peripartum onset, or postpartum depression, affects women during pregnancy or shortly postpartum.Bipolar disorder showcases mood swings between depression and mania, where manic episodes involve euphoric moods and increased activity.Individuals with panic disorder experience recurrent panic attacks and persistent concern about their recurrence, while generalized anxiety disorder entails ongoing anxiety without a specific trigger.Personality disorders fall into three clusters: Cluster A (odd or eccentric personalities), Cluster B (impulsive and erratic behaviors), and Cluster C (nervous and fearful traits).Body Dysmorphic Disorder centers on an obsessive concern over perceived physical flaws, prompting repetitive behaviors related to appearance.Post-Traumatic Stress Disorder (PTSD) arises from experiencing a traumatic event, leading to symptoms such as intrusive memories, avoidance of reminders, negative emotions, and hypervigilance.Persistent depressive disorder involves chronic sadness without fulfilling major depression criteria.Abnormal brain activity in emotional regulation areas, such as the amygdala, is linked to depression, exacerbated by stress-related cortisol increases.The biological perspective links them to genetic factors, chemical imbalances, and brain abnormalities, while the psychosocial perspective highlights the role of learning, stress, and environmental influences.Generalized Anxiety Disorder (GAD) is defined by a persistent state of uncontrolled and excessive worry.In contrast, Hoarding Disorder manifests as the inability to discard possessions, regardless of their actual worth.Key symptoms of schizophrenia include hallucinations, delusions, disorganized thinking, lack of motivation, expressionless face, reduced speech, and diminished social engagement.Factors during pregnancy, such as obstetric complications and maternal stress, and marijuana use, are implicated in the disorder's onset.There are varying perspectives on psychological disorders.

Psychological disorders are defined by the American Psychiatric Association (APA) through four main criteria: significant disturbances in thoughts, feelings, or behaviors; underlying biological, psychological, or developmental dysfunction; resultant distress or disability; and a lack of culturally approved responses. The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) serves as the authoritative classification system, outlining disorders, diagnostic features, symptoms, prevalence, risk factors, and comorbidity. The World Health Organization (WHO) also provides the International Classification of Diseases (ICD) for mental and physical diseases and their diagnostic criteria.

There are varying perspectives on psychological disorders. The biological perspective links them to genetic factors, chemical imbalances, and brain abnormalities, while the psychosocial perspective highlights the role of learning, stress, and environmental influences. The diathesis-stress model posits that individuals with a predisposition for disorders (diathesis) are more likely to develop them under stressful conditions.

Anxiety disorders, characterized by excessive fear and anxiety, include specific phobias and conditions like agoraphobia and social anxiety disorder. Panic attacks, which involve sudden intense fear or discomfort, are marked by physical symptoms such as sweating and trembling. Individuals with panic disorder experience recurrent panic attacks and persistent concern about their recurrence, while generalized anxiety disorder entails ongoing anxiety without a specific trigger.
Panic attacks often lead to excessive worry about potential consequences and self-defeating behaviors. Generalized Anxiety Disorder (GAD) is defined by a persistent state of uncontrolled and excessive worry. Obsessive-Compulsive Disorder (OCD) involves intrusive and unwanted thoughts (obsessions) and a compulsion to perform repetitive actions or mental tasks. Genetic factors and specific brain regions are associated with OCD. Body Dysmorphic Disorder centers on an obsessive concern over perceived physical flaws, prompting repetitive behaviors related to appearance. In contrast, Hoarding Disorder manifests as the inability to discard possessions, regardless of their actual worth.

Post-Traumatic Stress Disorder (PTSD) arises from experiencing a traumatic event, leading to symptoms such as intrusive memories, avoidance of reminders, negative emotions, and hypervigilance. These symptoms must persist for at least one month. Cognitive factors, such as memory disturbances and negative appraisals of the trauma, contribute to the condition's development. Risk factors for PTSD include trauma severity, lack of social support, low socioeconomic status, and prior mental health issues.

Major Depressive Disorder is marked by persistent sadness or diminished interest in activities, alongside weight changes, sleep issues, fatigue, feelings of guilt or worthlessness, and suicidal thoughts. Risk factors encompass unemployment, low income, urban living, and relationship breakdowns. Comorbidities often include anxiety and substance abuse disorders, significantly impairing daily functioning.
Depression poses a significant risk for heart disease and encompasses various subtypes. Seasonal affective disorder manifests as major depressive symptoms tied to specific seasons, while peripartum onset, or postpartum depression, affects women during pregnancy or shortly postpartum. Persistent depressive disorder involves chronic sadness without fulfilling major depression criteria. Bipolar disorder showcases mood swings between depression and mania, where manic episodes involve euphoric moods and increased activity. It affects 1% of people, often starting before age 25, with a higher prevalence in men, and many have comorbid conditions, primarily anxiety or substance abuse, alongside high suicide rates.

Mood disorders frequently stem from neurotransmitter imbalances, particularly norepinephrine and serotonin. Abnormal brain activity in emotional regulation areas, such as the amygdala, is linked to depression, exacerbated by stress-related cortisol increases. The diathesis-stress model indicates that gene-environment interactions, especially in those with a variant gene and a history of childhood maltreatment, contribute to depression. Cognitive theories suggest negative thinking patterns and stressful events trigger depressive episodes. Hopelessness theory emphasizes seeing negative events as having stable, global causes as a pathway to depression. Additionally, rumination can prolong depression.

Suicide risk is notably high among those with mood disorders, with contributing factors including substance abuse, prior attempts, and easy access to lethal means.
Serotonin dysfunction is often linked with withdrawal from relationships and reckless behavior, contributing to feelings of being trapped. Recent high-profile suicides highlight the seriousness of mental health issues, such as schizophrenia. Key symptoms of schizophrenia include hallucinations, delusions, disorganized thinking, lack of motivation, expressionless face, reduced speech, and diminished social engagement. Genetic vulnerability combined with environmental stress is essential for the development of schizophrenia, alongside the dopamine hypothesis, which posits that excess dopamine contributes to the disorder. Brain changes, like enlarged ventricles and reduced gray matter in the frontal lobes, are also observed in affected individuals. Factors during pregnancy, such as obstetric complications and maternal stress, and marijuana use, are implicated in the disorder's onset.

Dissociative disorders vary from dissociative identity disorder to depersonalization/derealization disorder and dissociative amnesia. Traumatic experiences are strongly linked to these conditions, suggesting that dissociation serves as a coping mechanism in the face of threat.

Personality disorders fall into three clusters: Cluster A (odd or eccentric personalities), Cluster B (impulsive and erratic behaviors), and Cluster C (nervous and fearful traits). In Cluster A, disorders such as paranoid personality disorder involve pervasive mistrust, while schizoid disorder is characterized by emotional detachment and lack of interest in relationships. Schizotypal individuals exhibit eccentric behaviors and suspiciousness.