Not everyone who is depressed has all depression's symptoms, but everyone who is depressed has at least some of them, co-existing, on most days. Depression can range in intensity from mild to severe. Depression can co-occur with other medical disorders such as cancer, heart disease, stroke, Parkinson's disease, Alzheimer's disease, and diabetes. In such cases, the depression is often overlooked and is not treated. If the depression is recognized and treated, a person's quality of life can be greatly improved. The hallmark of this problem is chronic worry and tension with no apparent cause. People suffering from generalized anxiety disorders may worry excessively about health, money, family, or work, often anticipating disaster. Although they are usually aware that their anxiety is more intense than necessary, they can't seem to let it go. Constant worrying contributes to trouble sleeping and relaxing. People with anxiety disorders may startle easily and have trouble concentrating. Generalized anxiety disorder often leads to depression. Experts have yet to agree on the root cause of anxiety disorders. In fact, most concede that several factors may be at work in each case.
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