You Feel Pain Others Don't. Here's Why Your Genes Control It.

COMT is an enzyme that clears stress hormones like dopamine, epinephrine, and norepinephrine from your brain and body. When COMT works normally, it keeps these chemicals at balanced levels. Think of it as a volume dial; the enzyme turns the dial down when things get too loud.

The Val158Met variant is the most common difference in COMT function. If you carry the Met/Met genotype (slow COMT), you have roughly 25% of people with European ancestry. Slow COMT means your brain and nervous system clear catecholamines very slowly. As a result, your prefrontal cortex and pain-processing regions stay flooded with dopamine and stress hormones. Your nervous system stays in a heightened state of arousal, pain signals come through louder, and your pain threshold drops. Everything feels more intense.

On a daily basis, this means minor pain feels significant. A tense muscle feels unbearable. Stress makes pain worse instantly because your nervous system is already saturated with stress hormones. You’re also likely sensitive to caffeine and stimulants,they push your already-high catecholamines even higher. And chronic pain may feel worse in the evening, when accumulated stress hormones have built up throughout the day.

Your body produces its own opioids called endogenous opioids (endorphins and enkephalins). These chemicals bind to opioid receptors in your brain and spinal cord and switch off pain signals. OPRM1 encodes the mu-opioid receptor, the primary target of these natural pain-relief chemicals. Think of the receptor as a lock, and endogenous opioids as the key. When the lock works normally, the key fits well and pain relief is efficient.

The A118G variant (rs1799971) changes the shape of this lock. If you carry the G allele, found in roughly 10-15% of people with European ancestry but 40% of East Asian ancestry, your opioid receptors have lower sensitivity to endogenous opioids. Your body is literally producing the same amount of pain-relief chemicals, but they don’t stick as well or last as long. Your natural pain-relief system is working at a fraction of its potential capacity. This means you experience less endogenous pain relief at baseline and recover more slowly from pain flare-ups.

You likely notice that opioid painkillers don’t work as well as they do for other people, or require higher doses. You may also find that activities other people use for pain relief,running, laughter, even dark chocolate,don’t give you the same endorphin boost. And chronic pain may feel relentless because your body’s natural ‘off switch’ isn’t as potent.

MTHFR is the methylenetetrahydrofolate reductase enzyme. It converts folate (dietary B9) into the active form your cells actually use for a process called methylation. Methylation reactions happen in every cell billions of times per day; they’re how your body tunes down pain signaling, regulates vascular tone, and produces neurotransmitters that modulate pain. When methylation works well, pain signals are properly suppressed.

The C677T variant, carried by roughly 40% of people with European ancestry, reduces MTHFR enzyme efficiency by 40-70%. This variant is one of the strongest genetic risk factors for migraine and chronic pain. With slower methylation, your neurons have trouble producing adequate amounts of pain-suppressing neurotransmitters. Additionally, impaired methylation raises homocysteine, which makes blood vessels less flexible and more reactive to pain triggers. You can eat a perfect diet and still have chronically impaired pain suppression at the cellular level. Your body is literally running on a reduced supply of the raw materials needed to turn off pain.

You likely experience migraines or tension headaches that don’t respond well to simple remedies. Pain sensitivity is worse when you’re stressed or tired (times when methylation demand spikes). You may have noticed that B vitamin supplementation sometimes helps, but generic supplements don’t move the needle. And if you have inflammation-related pain, it tends to feel stubborn and difficult to manage.

BDNF is brain-derived neurotrophic factor, a protein that shapes how your brain processes pain. Specifically, BDNF controls central sensitization, the process by which your nervous system learns to amplify pain signals. When central sensitization gets stuck in the ‘on’ position, minor inputs feel like major pain. BDNF also controls your ability to rewire painful neural pathways through neuroplasticity.

The Val66Met variant is carried by roughly 30% of the population. The Met allele is associated with reduced BDNF activity, especially in stress states. This impairs your brain’s capacity to downregulate central sensitization and rebuild pain-processing circuits. Your nervous system is less able to ‘unlearn’ pain amplification, and your brain’s pain regions stay stuck in high-alert mode. This is particularly problematic in fibromyalgia and chronic widespread pain, where the nervous system has essentially learned to treat normal sensations as dangerous.

You likely experience pain that spreads or worsens without obvious physical cause. Pain flare-ups can last for days or weeks even after minor triggers. You may notice that pain-processing seems to get worse over time rather than better, despite rest and treatment. And stress, poor sleep, or emotional triggers dramatically worsen your pain,signs that your central pain-processing system has become sensitized.

TRPV1 is a pain receptor found throughout your nervous system: in your skin, your digestive tract, and your spinal cord. It detects heat, physical pressure, and certain chemical irritants (like capsaicin in chili peppers or irritants in smoke). Under normal conditions, TRPV1 activates when there’s genuine danger, triggering pain to alert you. The receptor has a threshold; it only fires when stimuli are actually harmful.

Certain TRPV1 variants lower this activation threshold. With gain-of-function variants, found in roughly 25-30% of the population, your TRPV1 receptors activate more easily and fire more intensely. This means heat, pressure, and chemical stimuli that other people barely notice create noticeable pain for you. Your pain receptors are literally more trigger-happy. You have more pain fibers firing, more often, in response to ordinary sensations.

You likely notice you’re sensitive to heat; warm showers or summer weather cause discomfort others don’t experience. Pressure sensitivity is common,sitting in one position too long causes pain, tight clothing bothers you more than others, and massage or pressure therapy can feel painful rather than soothing. You may also be sensitive to spicy food, and environmental irritants (strong smells, air quality changes) trigger pain or burning sensations. Pain often has a burning quality rather than aching.

GCH1 encodes GTP cyclohydrolase 1, an enzyme that produces tetrahydrobiopterin (BH4). BH4 is a critical cofactor required by several pain-modulating neurotransmitter systems: it’s essential for producing serotonin, dopamine, and nitric oxide. All of these chemicals suppress pain signaling. Without adequate BH4, your nervous system cannot manufacture sufficient pain-relief neurotransmitters, no matter how much dietary precursor you consume.

Certain GCH1 variants affect BH4 production efficiency. Carriers of these variants, found in roughly 15-20% of the population, have lower BH4 availability. With reduced BH4, your neurons cannot efficiently convert dietary amino acids into serotonin and dopamine. Additionally, impaired nitric oxide production (which requires BH4) reduces vascular relaxation and pain-related vasodilation. Your brain is literally unable to manufacture enough of the chemicals that turn off pain signals. This is a production problem, not a consumption problem.

You likely experience depression or low mood alongside pain,both result from serotonin insufficiency. Pain sensitivity is worse in low-light conditions (which impair serotonin production). You may notice that standard antidepressants help only modestly, because the root issue is substrate availability, not reuptake. Cold sensitivity may accompany pain sensitivity due to impaired vasodilation. And pain may have a throbbing, burning quality, suggesting vascular involvement.