Most people don’t arrive at a therapist’s office knowing what’s wrong. They arrive exhausted and overwhelmed, unsure whether what they’re feeling is anxiety, depression, or something in between. Nearly half of people diagnosed with depression also meet the criteria for an anxiety disorder, and the line between the two is rarely as clear as the labels suggest.
The Brain Science Behind Anxiety and Depression
Both anxiety and depression involve disrupted communication between the prefrontal cortex and the amygdala. The prefrontal cortex regulates emotional responses; the amygdala fires the alarm. Under chronic stress, prefrontal control weakens, and the amygdala becomes overactive. That single disruption can look like anxiety in one person and depression in another, or shift between the two in the same person over time.
A 2025 genetic study found that overlapping symptoms, shared environmental stressors, and shared genetic risk all contribute to the frequency with which the two conditions co-occur. People presenting with both conditions showed the strongest genetic overlap, while those with only one still showed partially distinct patterns.
Konstantin Lukin, Ph.D., Licensed Clinical Psychologist and Founder of Lukin Center for Psychotherapy, sees this regularly in his work. “Anxiety and depression often grow in the same soil. Chronic stress, invalidation, and trauma. They need not appear identical in every person. Some may be more anxious, some more depressed, and some sit somewhere in the middle with a blend of both.”
How Anxiety and Depression Feed Each Other
The two conditions do not always show up at the same time. Sometimes anxiety comes first. A long-term study that followed teens found that having social anxiety was a sign of later depressive symptoms. Daily stresses, such as school and peer relationships, were found to link the two.
When anxiety comes first, it tends to wear a person down. Sustained worry and threat-focused thinking are exhausting, and over time, that exhaustion creates its own opening for depression to take hold.
The reverse can also happen. Depressive withdrawal and low self-worth create their own fertile ground for anxiety, particularly around social situations and performance.
The Thought Patterns That Link Anxiety and Depression
Catastrophic thinking sits at the intersection of both conditions. Anxious thinking tends to ask, “What if everything goes wrong?” Over time, that pattern can shift into a depressive certainty that nothing will go right regardless of what is done. A study on cognitive style found that habitually doubting one’s ability to cope with adverse events is associated with elevated levels of both anxiety and depression.
Shared thought patterns can make it hard to tell anxiety and depression apart — even for the person experiencing them. The overlap is significant enough that a person may not realize one condition has given way to the other. A person who started out dreading social situations may find themselves, months later, struggling to get out of bed. The worry did not disappear; it changed shape. Recognizing that shift is often the first step toward understanding what is actually going on.
Why Treating Only One Often Isn’t Enough
On average, people wait eleven years before seeking help for a mental health condition. By then, both conditions are usually well established, and treating only one tends to leave the other in place.
A clinical study on adolescent depression found that cognitive-behavioral therapy (CBT) combined with antidepressant medication produced stronger outcomes when anxiety was also present. Anxiety did not always fully resolve when depression alone was the focus of treatment. Addressing the underlying factors that feed both conditions — including sleep, stress responses, and thinking patterns — consistently produced broader improvement across both.
Roy J. DuPrez, MEd, Founder and CEO of Back2Basics Recovery, puts it in practical terms. “It’s common for progress to stall when only one piece of the problem is being addressed. The individual feels a little better, but not well. Closing that gap usually means looking at what is driving both sides of the problem.”
How to Get Help for Anxiety and Depression
For anyone recognizing these patterns in themselves, it is less important to label the experience as anxiety or depression than to understand what is driving both. Anxiety and depression share enough common ground that treatment addressing both tends to be more effective than approaches that treat them as unrelated problems.
Lukin puts it simply. “When we understand that these conditions share roots, we stop trying to treat them in isolation. That changes everything about how we approach care.”
Sleep, daily structure, , and working with a clinician who understands the overlap are all practical places to begin. The goal is not to choose between treating anxiety or depression. It is to understand what is feeding both, and start there.
Sleep, daily structure, reducing chronic stress, and working with a clinician who understands the overlap are all practical places to begin. Treatment does not have to choose between anxiety and depression. When both are addressed together, people tend to make more progress than when only one piece of the puzzle is in focus. If you are concerned about yourself or someone you care about, a good first step is reaching out to a mental health professional who can evaluate both conditions and recommend a treatment approach that addresses them together.
If you are concerned about yourself or someone you care about who may be struggling with anxiety and depression, our Resource Specialists can help you find the right mental health services in your community. Contact us now for more information on this free service.
About the Authors:
Dr. Konstantin Lukin, PhD, is a Licensed Clinical Psychologist and Founder of the Lukin Center for Psychotherapy. He specializes in anxiety, depression, and emotional regulation, integrating cognitive-behavioral and psychodynamic approaches. His work helps clients build resilience and insight by addressing how early experiences shape emotional health.
Kosta Condous, LMFT, is a Licensed Marriage and Family Therapist and Co-Founder of Higher Purpose Recovery. With extensive experience across inpatient and outpatient settings, he specializes in addiction, mental health, and co-occurring disorders. Kosta brings a leadership philosophy rooted in collaboration and creativity to elevate the standard of client care.
Photo by Siarhei Nester: https://www.pexels.com/photo/intricate-tree-roots-in-krabi-thailand-35125733/
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