Psychopathology is a branch of psychology that studies mental disorders. Mental disorders are characterized by changes in thinking, mood, and/or behavior. Psychopathology is a comprehensive field that includes research on the nature, causes, and treatments of mental disorders. Mental disorders can be caused by a variety of factors, including genetic predisposition, brain chemistry, and life experiences. Treatment for mental disorders may include medication, therapy, or a combination of both. The three main types of psychopathology are anxiety disorders, mood disorders, and substance-related disorders. Anxiety disorders are the most common type of psychopathology, affecting more than 20% of the population. Mood disorders, such as depression and bipolar disorder, are the second most common type of psychopathology, affecting around 10% of the population. Substance-related disorders, such as alcoholism and drug addiction, are the third most common type of psychopathology, affecting around 5% of the population. Psychopathology refers to a wide range of mental health disorders that are characterized by abnormal thoughts, emotions, and behaviors.