According to the Center for Disease Control, an estimated one in ten people suffer from Depression. A recent article by the World Health Organization noted that depression is the leading cause of disability worldwide, citing 350 million people who suffer from the disorder each year. In the U.S. alone, about 7% of all adults over the age of 18 reported experiencing depression in the preceding year.
A study in the American Journal of Psychiatry indicated that the misdiagnosis of depression is widespread and that even psychiatrists get the diagnosis right less than half the time. In other words, about 60% of depressed patients received an incorrect diagnosis before receiving the correct diagnosis. Furthermore, depression is often confused with bipolar disorder, seasonal affective disorder, and physical ailments such as fibromyalgia and chronic fatigue syndrome.