The Diagnosis That Misses the Mechanism
Anxiety disorders are among the most diagnosed conditions in the country. They're also among the most undertreated — because the standard clinical response is to address the symptom without investigating what's producing it.
You come in anxious. You leave with a prescription for an SSRI or a benzodiazepine. Sometimes therapy is recommended. Occasionally both.
What rarely happens: a serious investigation into the biological drivers that might be generating or significantly amplifying the anxiety experience.
This isn't an argument against medication. SSRIs are genuinely helpful for many people. It's an argument that they're often prescribed as a first answer to a question that hasn't been fully asked.
Anxiety as a Biological Signal
Anxiety — the persistent sense of unease, hypervigilance, catastrophic thinking, somatic tension — is fundamentally a nervous system state. And nervous system states are driven by biology.
Several biological drivers are reliably associated with anxiety that is frequently labeled 'primary psychiatric' when it's actually secondary to an underlying condition:
Cortisol dysregulation — the most common and most overlooked. Chronic stress (life stress, sleep deprivation, over-exercise, caloric restriction, illness) dysregulates the HPA axis. The result is a cortisol pattern that no longer follows its normal diurnal rhythm. High cortisol at night prevents deep sleep. Low cortisol in the morning produces flat, dysphoric fatigue. Reactive spikes throughout the day produce anxiety symptoms that have nothing to do with life circumstances.
Low thyroid — hypothyroidism and subclinical hypothyroidism produce anxiety in some patients — particularly the reactive, heart-pounding variety. The mechanism is partly cardiac (elevated resting heart rate) and partly neurological. Paradoxically, hyperthyroidism is the more well-known anxiety producer — but undertreated hypothyroidism creates its own version.
Estrogen and progesterone imbalance — in women, the perimenopausal and luteal-phase drops in progesterone (which is neurosteroid and GABA-ergic) are direct anxiety inducers. Many women who develop anxiety in their late 30s or 40s are experiencing the neurological effects of declining progesterone — not a new psychiatric disorder.
Low testosterone — testosterone has anxiolytic properties. In both men and women, low testosterone is associated with increased anxiety, social withdrawal, and reduced stress resilience. This doesn't appear in most anxiety workups.
Blood sugar dysregulation — hypoglycemia produces adrenaline, which produces anxiety symptoms indistinguishable from a panic response. Patients with insulin resistance frequently experience anxiety after meals as blood glucose spikes and then drops, triggering counter-regulatory hormones. This looks like anxiety disorder. It responds to dietary intervention.
Caffeine and stimulant load — obvious in retrospect, consistently underreported. Many patients presenting with anxiety are consuming 400–600mg of caffeine daily and haven't made the connection.
What a Biological Anxiety Workup Includes
At minimum:
- Cortisol (ideally a 4-point saliva curve, or morning serum at minimum)
- Full thyroid panel (TSH, Free T3, Free T4, antibodies)
- Sex hormones (estradiol, progesterone, testosterone, SHBG)
- Fasting glucose and insulin (HOMA-IR)
- Comprehensive metabolic panel
- CBC with differential (anemia produces anxiety)
- Ferritin (low iron produces anxiety symptoms independently of anemia)
- Vitamin B12 and D
This isn't a fringe workup. These are basic markers that together provide a picture of the biological terrain generating the patient's symptoms.
The Integrated Approach
When biological drivers are identified and corrected, two things often happen:
One: anxiety improves significantly — sometimes dramatically — without medication changes.
Two: when medication is still needed, it works better. Because the physiological noise that was amplifying the anxiety baseline has been reduced.
Therapy also works better when the underlying biological disruption isn't constantly refilling the tank.
This isn't to say anxiety is 'just hormones' or that psychological work doesn't matter. It's to say that treating anxiety without looking at biology is leaving meaningful tools on the table.
The Question Worth Asking
If you've been managing anxiety for years and feel like you've hit a ceiling — like the medication takes the edge off but doesn't resolve the underlying unease — a biological evaluation might reveal why.
Not because your experience isn't real. Because it might have a driver that hasn't been investigated yet.
PracticeRx offers integrated psychiatric care and comprehensive hormonal and metabolic workups. We don't treat anxiety in isolation — we evaluate what's producing it.