When Depression and Anxiety Overlap: Understanding MDD with Comorbid Anxiety

When Depression and Anxiety Overlap. By Natalie Blaum, Ph.D., MagVenture A/S. Major Depressive Disorder (MDD) and anxiety are often discussed as separate mental health conditions. In clinical practice, however, they frequently overlap. Many people living with depression also experience significant anxiety symptoms, such as persistent worry, tension, restlessness, or difficulty relaxing. When significant anxiety symptoms occur alongside depression, this is sometimes referred to as anxious depression or MDD with comorbid anxiety symptoms. The Prevalence of Comorbid Anxiety in MDD. Depression is one of the most common mental health conditions worldwide. For a substantial proportion of people with MDD, depression is accompanied by significant symptoms of anxiety. In the large STAR*D study of 1,450 people with MDD, approximately 46% met the study criteria for anxious depression. Other studies report prevalence estimates ranging from 50% to 75%. Importantly, having anxiety symptoms alongside MDD does not necessarily mean that a person has a separate generalized anxiety disorder. The Neurobiology of MDD with Comorbid Anxiety. Depression and anxiety involve complex and partly overlapping brain systems involved in emotional and cognitive processing. Recent neuroimaging research suggests that MDD with comorbid anxiety may be associated with differences in structural brain connectivity compared with MDD without comorbid anxiety. A large 2026 diffusion-MRI study found that individuals with MDD and a comorbid anxiety disorder showed increased structural connectivity within networks involving the insula, frontal, and temporal areas, whereas those without anxiety showed decreased connectivity. Treating MDD with Comorbid Anxiety. In the European Union, MagVenture TMS Therapy® is CE marked for the treatment of Major Depressive Disorder in adult patients who have failed to achieve satisfactory improvement from two prior antidepressant medications. For individuals who respond to treatment for MDD and who have symptoms of comorbid anxiety, the clinical benefit may also include improvement of anxiety symptoms. (Note: The CE-marked indication remains the treatment of Major Depressive Disorder, not a separate indication for an anxiety disorder). We Still Have a Lot to Learn. MDD with comorbid anxiety symptoms is a common and clinically important presentation of depression. Continued research into its neurobiology and treatment will help improve our understanding.