In laboratory settings, men consistently show higher pain tolerance than women, meaning they can endure a painful stimulus for longer before asking for it to stop. But that finding tells a much smaller story than most people assume. Women’s pain responses are more consistent and stable over time, hormones shift pain sensitivity dramatically across a single month, and social conditioning shapes how freely each sex reports pain in the first place. The real answer is far more complex than a simple ranking.
What Lab Studies Actually Show
When researchers apply heat, cold, pressure, or reduced blood flow to volunteers and measure how long they can stand it, men generally last longer. This has been replicated across many studies and pain types. Women tend to rate thermal pain as more intense and reach their limit faster during blood-flow-restriction tests.
But here’s the twist: women’s pain tolerance scores are far more consistent from one test session to the next. Research from the National Center for Complementary and Integrative Health found that female participants had higher test-retest reliability on all three standard pain measures, with the gap especially strong for tolerance. Men scored higher on average, but their numbers bounced around more between visits. In practical terms, women’s pain responses are more predictable and stable, which matters when you’re trying to draw meaningful conclusions from the data.
Hormones Create a Moving Target
One reason pain tolerance is so hard to compare between sexes is that female pain sensitivity isn’t a fixed number. It shifts with the menstrual cycle, sometimes dramatically. During the first half of the cycle, rising estrogen promotes the release of endorphins, the body’s natural painkillers. Estrogen also boosts the activity of the brain’s own opioid system, increasing the binding capacity of receptors that dampen pain signals. At this point in the cycle, women’s pain tolerance can rise noticeably.
The picture flips in the second half of the cycle. Falling progesterone levels are associated with heightened pain sensitivity, and estrogen fluctuations can promote inflammation that amplifies pain perception. Estrogen itself has a contradictory role: at high levels, it can simultaneously reduce pain through opioid pathways and increase it by ramping up the activity of pain-sensing receptors and making nerve cells more excitable. So depending on when a study is conducted relative to a woman’s cycle, the results can look very different.
Testosterone, meanwhile, provides a more straightforward protective effect. It raises pain thresholds in men by suppressing inflammatory signals and reducing the sensitivity of pain-detecting nerve cells. Studies using testosterone replacement have shown reduced pain in males, and transgender men receiving testosterone therapy also report increased pain thresholds. The consistently higher testosterone levels in biological males likely explain part of the tolerance gap seen in lab studies.
The Brain Processes Pain Differently
Brain imaging during painful stimulation reveals that men and women activate partially different neural networks. Women show greater activity in regions involved in emotional processing, body awareness, and movement planning, along with stronger deactivation in areas linked to reward and habit. Men show more activation in motor-planning regions. These aren’t better-or-worse differences. They suggest the two sexes may experience the same physical stimulus through somewhat different emotional and cognitive filters, which could influence both how intense pain feels and how someone responds to it.
Social Expectations Skew the Data
Lab pain tolerance is measured by asking someone to say when they’ve had enough. That makes it partly a social act, and social norms around pain are deeply gendered. Research on gender role expectations shows that men who strongly identify with traditional masculinity are more likely to underreport pain and feel embarrassed about admitting it. Women, by contrast, are socialized in environments that are more supportive of pain expression and awareness, making them more likely to acknowledge discomfort openly.
This means that some portion of the “tolerance gap” in experiments may reflect differences in willingness to report pain rather than differences in the actual sensory experience. A man gritting his teeth through an extra 30 seconds of cold water isn’t necessarily feeling less pain. He may simply be less willing to say stop. Separating genuine sensory differences from reporting behavior remains one of the biggest challenges in pain research.
Women Experience More Chronic Pain
Whatever the lab results show about acute tolerance, the real-world burden of chronic pain falls disproportionately on women. A systematic review and meta-analysis found that women in midlife are about 16% more likely to experience chronic pain than men of the same age. The gap widens for specific conditions: widespread chronic pain affects 15 to 21% of women compared to 4 to 13% of men, and fibromyalgia prevalence ranges from 3 to 20% in women versus 0 to 9% in men.
These numbers likely reflect a combination of hormonal influences, immune system differences, and genetic factors. Variants in genes that control how the body’s opioid system functions and how the brain breaks down mood-regulating chemicals have sex-specific effects on pain vulnerability. Women and men also differ in how efficiently their opioid signaling works at a molecular level, which can influence both baseline pain sensitivity and the likelihood of developing persistent pain.
Pain Medications Don’t Work the Same Way
The biological differences between sexes extend to how well pain medications work. The evidence on common opioid painkillers is surprisingly mixed. Some studies find that standard opioids like morphine are more potent in men, while others show equal or even greater effectiveness in women. Certain types of painkillers that work on different receptor systems appear to provide better relief for women, particularly after surgery and dental procedures.
One consistent finding from a population study in Taiwan is that women used significantly less morphine through self-administered pumps during the first three days after surgery than men did. Whether that reflects lower pain, greater drug sensitivity, or different attitudes toward medication use is still debated. What’s clear is that a one-size-fits-all approach to pain treatment misses real biological differences between sexes.
What About Childbirth?
The idea that women must have higher pain tolerance because they endure childbirth is intuitive but doesn’t hold up as a simple argument. Labor pain is managed through a specific set of hormonal responses, including massive surges of endorphins, that don’t reflect everyday pain tolerance. The body’s pain-management system during labor is a specialized adaptation, not evidence of a general baseline advantage. Evolutionary research on childbirth pain has focused more on its role in strengthening social bonds between partners and caregivers than on any lasting change to pain sensitivity.
The bottom line is that “pain tolerance” isn’t a single trait you can rank on a leaderboard. Men tolerate acute experimental pain longer on average, but women’s responses are more reliable. Hormones make female pain sensitivity a moving target that can swing from high tolerance to high sensitivity within weeks. Social conditioning encourages men to tough it out and women to speak up. And when it comes to the chronic pain conditions that affect daily life, women bear a heavier burden by nearly every measure.