Also known as clinical depression, major depression is a type of depression in which the person’s life is affected significantly by the condition for an extended period. Medical science has yet to discover the actual cause of depression, although there are numerous triggers and mitigating factors. Most cases of depression are treated with a combination of therapy and medication, although some patients notice a marked improvement by using marijuana. It is important to note that depression is a complex issue, and not everyone will respond to treatments in the same way. Patients planning to use marijuana as a treatment for depression should therefore consult with a doctor beforehand, particularly if he is already undergoing treatment.