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A mental illness or mental disorder is a disease that causes disturbances in thought and/or behavior and results in an inability to cope with the ordinary responsibilities and routines of everyday life.

According to Mental Health America (formerly known as the National Mental Health Association), there are over 200 classified forms of mental illness that affect about 54 million Americans each year. Depression, bipolar, anxiety disorders, such as Obsessive Compulsive Disorder and phobias, dementia, and schizophrenia, are a few of the more known disorders that most people have come across.

Psychological Disorders

Anxiety Disorders

Bipolar Disorder

Cluster A (odd or eccentric disorders)

Paranoid Personality Disorder (PPD)

Schizoid Personality Disorder (SPD)

Schizotypal Personality Disorder

Cluster B (dramatic, emotional, or erratic disorders)

Antisocial Personality Disorder (APD or ASPD)

Borderline Personality Disorder (BPD)

Histrionic Personality Disorder (HPD)

Narcissistic Personality Disorder (NPD)

Cluster C (anxious or fearful disorders)

Avoidant Personality Disorder (APD or AvPD)

Dependent Personality Disorder (DPD)

Obsessive-Compulsive Personality Disorder (OCPD)
(note that this is not the same as Obsessive Compulsive Disorder)

Dissociative Identity Disorder / Multiple Personality Disorder