You're anxious for no reason. Your genes may be why.

Your COMT gene encodes an enzyme that breaks down stress hormones. When it’s working properly, dopamine, norepinephrine, and epinephrine spike during a real threat, then clear out once the danger passes. That’s how your nervous system returns to calm.

The Val158Met variant slows this enzyme down. Roughly 25% of people of European ancestry are homozygous for the slow version. Your stress hormones stay elevated long after the threat is gone, creating a state of perpetual alertness. You feel wired, reactive, and unable to relax even when nothing is happening.

This is why you might startle easily, overreact to minor frustrations, or find that your mind races at night. Your body doesn’t have an off switch because the hormones telling it to stay alert never fully clear.

Your SLC6A4 gene codes for the serotonin transporter, a protein that recycles serotonin from the synapse back into the neuron so it can be used again. This recycling process is how your brain keeps serotonin available over time.

The short allele variant of 5-HTTLPR (the most common form tested) impairs this recycling. Roughly 40% of people carry at least one short allele. Your brain recycles serotonin more slowly, leaving you with lower effective serotonin activity even if you eat all the right precursors. This is why you might feel anxious, pessimistic, and unable to bounce back from minor setbacks.

You’re not depressed in the clinical sense, but you lack resilience. Stress that others shrug off sits with you. Uncertainty feels dangerous. You replay conversations obsessively. This is serotonin dysregulation speaking.

Your MAOA gene encodes monoamine oxidase A, an enzyme that degrades serotonin, dopamine, and norepinephrine once they’ve finished their job in the synapse. This enzyme keeps neurotransmitter levels stable and predictable.

The MAOA-L (low activity) variant breaks down these neurotransmitters more slowly. Roughly 30 to 40% of males carry this variant. Your neurotransmitter levels fluctuate unpredictably, creating mood and anxiety swings that feel unmoored from circumstance. You might feel fine one moment and panicked the next, with no change in your environment.

This creates a unique form of anxiety where you feel emotionally unstable and reactive. You’re hyperaware of bodily sensations. A racing heartbeat triggers catastrophic thinking because your neurotransmitter flux makes you feel unsafe inside your own body.

Your FKBP5 gene encodes a protein that regulates how your cells respond to cortisol, the main stress hormone. When cortisol binds to glucocorticoid receptors, FKBP5 helps lock in the signal so your body can respond appropriately, then turn off the response.

The rs1360780 variant impairs this feedback mechanism. Roughly 30% of people carry this variant. Your cortisol response doesn’t shut down efficiently after stress, meaning your stress system stays activated long after the threat is gone. Even a minor stressor triggers a cascade that takes hours or days to resolve.

You might notice this as a persistent low-level dread that arrives after conflict, a late meeting, or bad news. Long after the event ends, your body is still flooded with cortisol. This keeps you in a state of hypervigilance, scanning for the next threat.

Your BDNF gene codes for brain-derived neurotrophic factor, a protein that supports neuroplasticity, the ability of your brain to rewire itself and adapt. BDNF is essential for learning, memory, and for the brain’s ability to escape anxiety patterns.

The Val66Met variant reduces how much BDNF your brain secretes. Roughly 30% of people carry the Met allele. Your brain struggles to form new neural pathways, making it harder for anxiety treatments, therapy, and even medications to create lasting change. You might have done years of therapy without major improvement, or switched SSRIs multiple times with limited benefit.

This isn’t because you’re resistant to treatment. It’s because your brain’s ability to rewire is genetically constrained. You have less plasticity to work with, so interventions need to be targeted and sustained to overcome the limitation.

Your GAD1 gene codes for glutamic acid decarboxylase 1, an enzyme that synthesizes GABA, the main inhibitory neurotransmitter in your brain. GABA is your nervous system’s brake pedal. Without adequate GABA, your neurons fire too readily and your mind won’t quiet.

Variants in GAD1 reduce enzyme activity, lowering GABA production. Roughly 20 to 30% of people carry these variants. Your brain has less inhibitory tone, meaning your nervous system is naturally biased toward activation and anxiety. You might feel restless, unable to settle into stillness, and prone to intrusive thoughts.

You probably notice this most at night. Your mind won’t stop. Racing thoughts, rumination, and a sense of unease prevent sleep. You’re not thinking about anything specific, just caught in a loop of mental activation that GABA would normally suppress.