Clients that present with symptoms of depression often are not convinced that they are truly suffering from this disorder. It an be left misdiagnosed or ignored for long periods of time due to the variation in presentation. Determined if someone has clinical depression, dysthymia, bi-polar or sadness is best left to professional diagnosis. The variation in the areas of depression and why for instance it may be occurring is a good reason just to talk through these symptoms with someone with training that you trust. Often the issue is unrelated to life circumstances and is instead related to a biological condition, for instance hormonal fluctuations or an undiagnosed thyroid condition, and without a professional consultation individuals can struggle sometimes for years without proper intervention.