The most common mental disorder in the United States is anxiety, which affects about 40 million adults or about 18.1% of the population. Anxiety disorders are highly treatable; however, less than 40% of those suffering (36.9%) receive treatment. Anxiety disorders include general anxiety disorder (GAD), panic disorders, phobias, obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD). Mood disorders are another common mental disorder. Mood disorders include major depression, bipolar disorder, and seasonal affective disorder. It is common for those struggling with one mental disorder to have multiple. For example, a large proportion of people suffering from anxiety also suffer from depression. Luckily, there are various methods for treatment available for those suffering from mental health problems. Treatment plans are highly individualized for each person and can typically involve a combination of treatment types. Treatment types include psychotherapy (talking therapy), medication, and self-help.