Depression is a mental health disorder that affects the lives of millions. Statistics from the World Health Organization show that about 121 million people worldwide are clinically depressed. The symptoms of depression go far beyond just feeling sad. It is a serious disorder that can make it difficult for sufferers to cope with daily life. At its worst, depression can lead to suicide. "Major depression affects more than 5 percent of teens and is linked with suicide, substance abuse and other serious problems. Yet it often goes undiagnosed and untreated," explains USA TODAY, the Nation's No. 1 Newspaper. The good news is that available treatments such as medication and psychotherapy can help most people with depression to lead normal, healthy lives.