The Cleveland Clinic

Depression:
The Link Between Depression and Other Mental Illnesses

Depression can be triggered by other mental illnesses, but it can also lead to certain mental illnesses. These include anxiety disorders , schizophrenia, eating disorders and substance abuse. Together, these conditions affect millions of Americans each year. Fortunately, they can be treated effectively -- allowing those affected to lead normal and productive lives.

Anxiety Disorders

Anxiety disorders produce an intense, often unrealistic and excessive state of apprehension and fear. They can occur during a given situation, or in anticipation of a particular situation occurring. When anxiety strikes, a person's blood pressure may rise, his or her heart races and breathing becomes more rapid. The person may also feel nauseated and experience other signs of agitation and discomfort. The causes of anxiety are as individual as the people affected, and the symptoms vary widely in degree.

Anxiety disorders will affect close to 25 million people at some time in their lives, affecting women twice as frequently as men. Some of the most common anxiety disorders are: Panic disorder , social phobia, agoraphobia, posttraumatic stress disorder , obsessive-compulsive disorder and generalized anxiety disorder .