Mood disorders affect approximately twenty percent of the entire population in the United States: there are four types- major depression; cyclothymia, or a mild form of bipolar disorder; seasonal affective disorder; and mania, a euphoria that leads to hyperactivity, over-inflated ego and unrealistic optimism.
Bipolar disorder (type 1 and 2) occur at a rate of about one percent of the general population, but many doctors believe that the diagnosis may be overlooked as mild forms of mania might not be viewed as illness.
Alcoholism and other forms of substance abuse can be related to depression as well.
Those suffering mood disorders are often more affected by depression, often are more self-critical, irritable, impulsive and hypersensitive to loss. Most people suffering depression will also how signs of anxiety, with 15 to 30 percent suffering panic attacks. Chronically anxious people may try to self-medicate with alcohol and drugs.
So if you or somebody that you know even slightly suspect a mood disorder I urge you to go out and get screened by a Mental Health Professional as soon as possible because it may save their life or at the very least make it a lot more bearable.