What you carry at this position in your DNA and what research says about it.
Pain Sensitivity: 5/10 evidence, 53 publications.
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Sample genotype (not yours): C/C
Higher Pain Sensitivity and Sharp Mental Focus
This genotype is linked to higher sensitivity to physical pain but may offer advantages in tasks requiring deep focus and planning. It is also associated with a higher risk of certain medication side effects.
What this genotype means: Higher sensitivity to physical pain; Enhanced working memory and planning; Increased risk of antipsychotic side effects.
Sample genotype (not yours): C/G
Typical Pain Sensitivity and Balanced Focus
This genotype represents a balanced intermediate state, showing typical pain tolerance and average cognitive performance under stress.
What this genotype means: Typical pain tolerance; Balanced cognitive performance; Moderate response to pain medications.
Sample genotype (not yours): G/G
Lower Pain Sensitivity and Resilient Stress Response
This genotype is associated with high pain tolerance and greater resilience under stress, though it may slightly reduce cognitive planning efficiency.
What this genotype means: High tolerance for physical pain; Greater resilience under acute stress; Typical risk for antipsychotic side effects.
Gene function and biological role
Gene Function: The COMT gene provides instructions for making the catechol-O-methyltransferase enzyme, which plays a crucial role in breaking down neurotransmitters like dopamine, epinephrine, and norepinephrine in the brain [1]. By regulating these chemical messengers, the enzyme directly influences cognitive processes, mood, stress response, and pain perception [2]. It is particularly active in the prefrontal cortex, the brain region responsible for planning, decision-making, and personality expression [3]. Variations in this gene can significantly alter how quickly these neurotransmitters are cleared, leading to distinct behavioral and physiological profiles [4].
Variant Impact: The rs4818 variant is a synonymous change in the COMT gene, meaning it does not alter the final amino acid sequence of the protein [5]. However, this genetic change significantly affects the secondary structure and stability of the messenger RNA, which in turn alters how efficiently the enzyme is produced [6]. This translation difference can lead to up to an 18-fold variation in COMT enzyme activity [4]. The C allele is associated with lower enzyme activity and higher dopamine levels, while the G allele leads to higher enzyme activity and lower dopamine levels [7].
Key Insight: Although this genetic change is synonymous and does not alter the protein structure, it drastically changes how much enzyme your body produces by altering mRNA stability. This single letter change helps define whether you fall into the warrior category of high pain tolerance or the worrier category of sharp mental focus.
Location: COMT. Chromosome 22 · 22q11.21 · 20.0 Mb
Estimated prevalence by population
Global 46.5%; European 36.6%; African 63.1%; East Asian 45.7%; South Asian 47.5%; Americas 48.5%; Ashkenazi 28.0%; Finnish 48.9%; Middle Eastern 33.5%; Amish 48.2%.
Estimated CC genotype frequency.
Global 42.4%; European 47.8%; African 32.7%; East Asian 43.8%; South Asian 42.8%; Americas 42.3%; Ashkenazi 49.8%; Finnish 42.1%; Middle Eastern 48.8%; Amish 42.5%.
Estimated CG genotype frequency.
Global 11.1%; European 15.6%; African 4.2%; East Asian 10.5%; South Asian 9.7%; Americas 9.2%; Ashkenazi 22.1%; Finnish 9.0%; Middle Eastern 17.7%; Amish 9.4%.
Estimated GG genotype frequency.
Showing effects for C/C genotype
Organ Systems
Chronic Pain
Pain Sensitivity. Evidence: 4/10. Source: PMID 22528689. Higher Sensitivity.
Neurology & Mental Health
Cognitive Performance
Cognitive Focus. Evidence: 4/10. Source: PMID 18037454. Enhanced Focus.
Pharmacogenomics
Antidepressant & Psychiatric Drug Response
Antipsychotic Side Effects. Evidence: 5/10. Source: PMID 38142723. Increased Severity.
Quetiapine Response. Evidence: 5/10. Source: PMID 26282453. Poorer Response.
Pain Medication Response
Evidence: 5/10. Source: PMID 19094200. Higher Sensitivity.
Showing effects for C/G genotype
Pain Sensitivity. Evidence: 4/10. Source: PMID 22528689. Typical Sensitivity.
Cognitive Focus. Evidence: 4/10. Source: PMID 18037454. Typical Focus.
Showing effects for G/G genotype
Pain Sensitivity. Evidence: 4/10. Source: PMID 22528689. Lower Sensitivity.
Cognitive Focus. Evidence: 4/10. Source: PMID 18037454. Reduced Focus.
Antipsychotic Side Effects. Evidence: 5/10. Source: PMID 38142723. Typical Risk.
Quetiapine Response. Evidence: 5/10. Source: PMID 26282453. Typical Response.
Evidence: 5/10. Source: PMID 19094200. Typical Response.
What this genotype means for the people who carry it
Sample genotype: CC (Homozygous)
Having two copies of the C allele results in significantly lower COMT enzyme activity, which means dopamine is cleared more slowly from the prefrontal cortex [1]. This abundance of dopamine can enhance working memory, planning, and executive function under normal conditions [2]. However, the downside is a heightened sensitivity to physical pain and a lower threshold for chronic pain conditions [3]. Research shows that individuals with this profile report higher pain scores and are more susceptible to conditions like fibromyalgia [4]. Additionally, this genotype is associated with an increased risk of developing tardive dyskinesia when taking antipsychotic medications [5].
Higher sensitivity to physical pain; Enhanced working memory and planning; Increased risk of antipsychotic side effects.
Sample genotype: CG (Heterozygous)
Carrying one C allele and one G allele results in intermediate COMT enzyme activity and balanced dopamine clearance [1]. This intermediate state generally provides a typical level of pain sensitivity and average cognitive performance [2]. You do not experience the extreme pain sensitivity of the CC genotype, nor do you have the lower cognitive planning scores sometimes seen in GG carriers [3]. However, because you carry one C allele, you may still have a slightly higher risk of certain medication side effects, such as tardive dyskinesia from antipsychotics, compared to those with the GG genotype [4]. You also tend to be more sensitive to morphine for pain management than GG carriers [5].
Typical pain tolerance; Balanced cognitive performance; Moderate response to pain medications.
Sample genotype: GG (Homozygous)
Having two copies of the G allele leads to high COMT enzyme activity, resulting in rapid clearance of dopamine from the prefrontal cortex [1]. This rapid clearance is associated with lower pain sensitivity, making you more resilient to physical discomfort and chronic pain [2]. This profile is often referred to as the warrior phenotype because of its high tolerance for physical stress [3]. On the cognitive side, lower baseline dopamine levels can sometimes make complex planning and working memory tasks slightly less efficient under normal conditions [4]. However, this genotype is protective against certain medication side effects, showing a typical risk profile for antipsychotic-induced tardive dyskinesia [5].
High tolerance for physical pain; Greater resilience under acute stress; Typical risk for antipsychotic side effects.
Variants with shared genetic architecture
rs165722 · COMT Gene · Chr 22 · Opioid Nausea Risk
rs4633 · COMT Gene · Chr 22 · Endometrial Cancer Risk
rs4680 · COMT Gene · Chr 22 · Stress and Focus
Through the looking glass: differential noradenergic modulation of prefrontal cortical function.
Pain sensitivity in fibromyalgia is associated with catechol-O-methyltransferase (COMT) gene.
Planning, decision-making and the COMT rs4818 polymorphism in healthy males.
Catecholamine-o-methyltransferase polymorphisms are associated with postoperative pain intensity.
Content updated August 2026.
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