Your Body Is Screaming, But Your Doctor Says You're Fine.

COMT is an enzyme that breaks down stress hormones like epinephrine and norepinephrine, as well as dopamine. It’s your body’s clearing mechanism for the chemicals that activate your fight-or-flight response. When it works normally, stress hormones rise during a threat, then drop back to baseline once the threat passes. Your nervous system returns to calm.

If you carry the Val158Met variant that produces slow COMT, your body clears these stress hormones at a fraction of normal speed. Roughly 25% of people of European ancestry carry two copies of this slow variant. Your stress hormones stay elevated long after the stressor is gone, keeping your body locked in a state of high alert.

This feels like constant low-grade panic. Your chest stays tight. Your shoulders won’t relax. You feel jumpy and reactive. Caffeine makes you feel wired for hours. Unexpected noises startle you intensely. You can’t seem to shift out of fight-or-flight even in safe moments. You may also experience racing thoughts, difficulty focusing, or a sense of emotional overwhelm that seems disproportionate to what’s actually happening.

FKBP5 is a gene that controls how your body’s stress feedback system works. When you encounter stress, your adrenal glands release cortisol. Normally, cortisol triggers a signal back to your brain saying, ‘Okay, you’ve released enough, stop now.’ This negative feedback loop is what allows your stress response to shut off. It’s your body’s braking system.

If you carry the rs1360780 variant of FKBP5, this braking system doesn’t work efficiently. Roughly 30% of the population carries this variant. Your cortisol stays elevated long after a stressor passes, and it takes far longer for your body to return to baseline.

You experience this as a prolonged sense of dread or unease after something stressful happens. A difficult conversation at work leaves you dysregulated for the entire evening. A single piece of critical feedback replays in your mind for days. Your body stays in a state of persistent low-grade activation. You may notice you’re more vulnerable to burnout, that your recovery from stress is slow, and that you feel physically exhausted even when you’re not doing anything demanding.

SLC6A4 produces the serotonin transporter, a protein that recycles serotonin back into nerve cells after it’s been used. Serotonin is your primary mood-stabilizing and anxiety-buffering neurotransmitter. It helps your nervous system stay calm and process emotions without becoming overwhelmed. When serotonin recycling works well, you have steady access to this calming chemical throughout the day.

If you carry the short allele variant of 5-HTTLPR, your serotonin transporter is less efficient. Roughly 40% of the population carries at least one short allele. Your brain doesn’t recycle serotonin as effectively, leaving you with lower available serotonin under stress.

You experience this as heightened emotional reactivity and rapid mood deterioration during high-demand periods. Minor annoyances feel like catastrophes. You’re more vulnerable to anxiety and overwhelm. Your nervous system feels raw and exposed. Under pressure, your mood crashes more easily. You may notice you’re more reactive to social stress, criticism, or unpredictability. Paradoxically, you might also crave intense experiences or stimulation because your serotonin baseline is lower.

MAOA is an enzyme that breaks down excess serotonin, dopamine, and norepinephrine. It’s your brain’s second line of defense for managing neurotransmitter levels. Where COMT handles the stress hormones in your body, MAOA handles them in your brain. When MAOA works efficiently, your brain maintains stable neurotransmitter levels and mood regulation.

If you carry the MAOA-L (low-activity) variant, this enzyme works slowly. Roughly 30-40% of males carry this variant. Neurotransmitters accumulate in your brain and stay active longer, creating fluctuating emotional and stress reactivity.

You experience this as emotional volatility and intensity. Your moods shift more easily. You feel things more intensely than others seem to. You may have a tendency toward anger that rises quickly, or anxiety that spikes sharply with perceived threat. Your nervous system is more reactive and harder to calm. You likely notice you’re sensitive to stress, prone to overstimulation, and take longer to recover from emotional intensity. You may also be more prone to impulsive reactions before thinking things through.

BDNF, brain-derived neurotrophic factor, is a protein that helps your brain adapt to stress and recover from it. It supports the growth and resilience of neurons in regions that control mood, memory, and emotional regulation. When BDNF is abundant and active, your brain bounces back from stress more easily. You’re neurologically more flexible and resilient.

If you carry the Val66Met variant with the Met allele, your BDNF production is reduced. Roughly 30% of the population carries this variant. Your brain has a harder time adapting to and recovering from stress, making burnout more likely and recovery slower.

You experience this as persistent low recovery and difficulty bouncing back from demanding periods. You feel ‘stuck’ in stressed state longer than others do. Your anxiety tends to become chronic rather than acute and responsive. You may notice that stress interventions that work quickly for others take weeks or months to help you. You’re more vulnerable to burnout because your nervous system lacks the neuroplasticity to adapt quickly to ongoing demand. You may also notice your mood improves more slowly after a difficult period.

NR3C1 produces the glucocorticoid receptor, a protein that sits on cells throughout your body and brain and receives the cortisol signal during stress. This receptor is how your cortisol actually works. When it functions well, cortisol binds effectively, triggers the appropriate stress response, and then stops. Your body listens to cortisol’s message efficiently and completes the stress cycle.

If you carry certain regulatory variants in NR3C1, your glucocorticoid receptors are less sensitive or less abundant. Roughly 40% of the population carries risk variants. Your cells don’t respond to cortisol as effectively, requiring your body to produce more cortisol to achieve the same effect.

You experience this as a dampened stress response that your body tries to compensate for by producing even more cortisol. This drives chronic elevation of stress hormones, increased inflammation, and a persistent sense of being unable to shift out of stress mode. You may feel physically exhausted but mentally wired. You might have a high pain threshold but also feel chronically sore or achy. Your immune system is likely compromised from chronic cortisol elevation, and you catch colds easily. You may also experience weight gain despite diet and exercise, or difficulty recovering from illness or injury.