People with mental disorders (a condition that makes it more difficult to cope with everyday life) and people with mental illness (a severe, lasting mental disorder that requires long-term treatment) experience a wide range of effects. According to the National Institute of Mental Health (NIMH), the United States has over 50 million adults with mental illness or mental disorder, or 20 percent of the total adult population. Of these, 13 million have what is considered serious mental illness or mental disorder (5 percent of the adult population); serious mental illness is that which causes impairment or disability. Finally, 16.5 percent of children aged 6-17 experienced mental illness or disorder.
The most common mental disorders in the United States are anxiety disorders. Almost 18 percent of U.S. adults are likely to be affected in a single year, and 28 percent are likely to be affected over the course of a lifetime. It is important to distinguish between occasional feelings of anxiety and a true anxiety disorder. Anxiety is a normal reaction to stress that we all feel at some point, but anxiety disorders are feelings of worry and fearfulness that last for months at a time. Anxiety disorders include obsessive compulsive disorder (OCD), panic disorders, posttraumatic stress disorder (PTSD), and both social and specific phobias.