Depression and Anxiety: How to Compare and Tell the Difference

Plenty of people mix up these two conditions, and the confusion gets worse when someone receives both diagnoses at once. David Carbonell, Ph.D., has written about why that happens. In his framing, anxiety disorders revolve around doubt and a sense of vulnerability about what hasn't happened yet. The anxious mind stays trained on the future and on the conviction that whatever is coming will turn out badly. That shows up as anxious thoughts, physical sensations that don't trace back to any medical cause, and behaviors built around avoidance or self-protection.

Depression looks different on the ground. Someone in a depressive episode tends to feel sad or hopeless and loses interest in things that used to be enjoyable. The body often aches with no physical explanation, and energy runs low. Concentration slips, memory gets foggy, and decisions feel hard to make. Appetite and weight can shift, sleep patterns change in unwanted ways, and thoughts of death or suicide may surface.

So where's the line? A depressed person carries a low mood, moves through the day with low-energy behavior, and thinks in negative terms. A person with an anxiety disorder is flooded instead by fear and worry about something that might happen, whether soon or years off. Worry is the lead symptom for anxiety, more than low mood or impaired functioning. Carbonell puts the contrast this way: depressed people aren't preoccupied with imagining future harm, because they feel they already know the outcome and expect it to be the same bad stuff they're living through right now.

Bipolar disorder sits apart from both. It's defined by swings in mood that can come on fast, climbing to a manic high or dropping to a depressive low that may or may not carry suicidal thoughts. During mania a person might have racing thoughts, trouble staying on task, a pull toward risky behavior, an elevated mood, delusional beliefs, less need for sleep or food, rapid speech, and impulsiveness. The depressive side mirrors ordinary depression: feelings of hopelessness or helplessness, heavy sadness, reduced physical activity, loss of interest in things once enjoyed, lower energy and motivation, changes in eating and sleep, and in some cases suicidal thoughts, plans, or attempts.

The overlap is a big reason the two get tangled together, both for the general public and for people managing both diagnoses at once. Several symptoms look alike. On top of that, the medications cross over. People with depression are often given antidepressants, and one class of them, the Selective Serotonin Reuptake Inhibitors (SSRIs), has been shown to help with anxiety as well as depression. Many physicians and psychiatrists reach for this approach first.

Antidepressants come in two broad families: tricyclics and SSRIs. An SSRI like fluoxetine (Prozac) can treat depressive symptoms, anxiety symptoms, or both together. Because of that, being handed a prescription for an antidepressant doesn't automatically mean you've been diagnosed with depression. It may simply be addressing the anxiety.

The reverse pattern is common too. People struggling badly with an anxiety disorder often start feeling depressed because of how much the anxiety is disrupting their lives. Carbonell notes from his own practice that for most patients in this situation, the depression tends to lift on its own as they make headway against the anxiety, with no separate treatment required for the low mood. There are exceptions. Sometimes the anxiety drives a person so far down that they can't or won't do the work of tackling the anxiety itself. At that point it makes sense to bring in medication, cognitive behavioral methods, or a combination of therapy and medication to handle both the depressive and anxious symptoms.

Sorting out whether you're dealing with depression, anxiety, or both can be genuinely hard on your own. A professional evaluation gives you a clearer read on what you're experiencing. If you're already in treatment, raise it with your doctor or therapist so you understand the symptoms, the diagnosis, and the plan for addressing them.

- Kim B.