Most times, people suffer from depression for lot of reasons. In about 50 percent of the cases, people experiencing depression also exhibit signs of another disorder.
Studies has also shown that about 20 percent of Americans who have anxiety or mood disorder e.g. depression do have substance abuse.
Bipolar disorder was first called manic depression. It is simply known to be a medical condition that leads to high mood swings such as emotional highs (mania or hypomania) and lows (depression).
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