Causes
Throughout studies of anxiety disorders and depressive disorders, scientists have come to multiple conclusions about the cause. This disorder is caused by a combination of biological, psychological, and environmental factors. These factors include imbalances to neurotransmitters in the brain, traumas, stresses, and an unstable home environment. Since the possible causes of anxiety disorders and depressive disorders are so similar, it is not surprising that these disorders occur so frequently together: approximately 58% of patients with major depression also have an anxiety disorder, and approximately 17.2% of patients with generalized anxiety disorder also have depression.
Read more about this topic: Mixed Anxiety-depressive Disorder