§ Claim under review · Health
"Before puberty, boys are more likely to have asthma, but after puberty, that pattern reverses. By adulthood, about one in 10 women in the U.S. has asthma, nearly twice the rate among men. Researchers are now getting closer to understanding that shift, including how hormones such as estrogen can influence airway inflammation and the severity of asthma symptoms."
Verdict
Mostly accurate
Confidence
HighSummary
This National Geographic post is mostly accurate and matches CDC data. Federal survey data confirms that about 10 percent of adult U.S. women report current asthma, compared with roughly 6.5 percent of adult men. It also confirms the childhood pattern the post describes, with boys having higher asthma rates than girls, and a reversal that shows up in the teenage years. The one imprecision is the phrase "nearly twice the rate among men." The actual gap is closer to 1.6 or 1.7 times, not double, so the wording rounds the difference upward. It is also worth knowing that these numbers come from people self-reporting a doctor's diagnosis rather than from lung function tests, and researchers have not settled whether the adult gap is driven purely by biology or partly by differences in how symptoms are reported and diagnosed. The estrogen explanation the post mentions is a genuine and active area of research, but much of the underlying mechanistic work is in animal models and is not yet a proven cause in humans.
The readings
key figures from the evidenceadult female current asthma prevalence, NHIS 2021
adult male current asthma prevalence, NHIS 2021
adjusted prevalence ratio, adult women vs men (NHIS 2021)
Why this verdict
Evidence
The National Geographic article the post links to exists and is real. Its underlying prevalence figures match federal data.
CDC national data confirms both halves of the pattern. Among adults, current asthma prevalence was higher among females than males, at 9.8 percent for females versus 6.2 percent for males, an adjusted prevalence ratio of 1.57 (95% CI 1.43 to 1.73) . In the same dataset, current asthma prevalence was lower among female children at 5.6 percent, an adjusted prevalence ratio of 0.77 (95% CI 0.64 to 0.93), compared with male children at 7.3 percent .
More recent CDC tables show the same direction with slightly higher numbers. In the 2022 NHIS national table, adult females had a current asthma prevalence of 10.8 percent and adult males 6.5 percent, while among children under 18 the figures reversed to 7.0 percent for males and 5.4 percent for females. The American Lung Association, summarizing the same source, states that among children, current asthma is more common for males at 7.0 percent than females at 5.4 percent, while among adults females at 10.8 percent are more likely than males at 6.5 percent to still have asthma .
Age-stratified NHIS tables show where the crossover sits. In 2019, ages 5 to 14 showed 11.2 percent for males versus 6.9 percent for females, while ages 15 to 34 showed 6.8 percent for males versus 9.8 percent for females. The 2020 table shows the same reversal (ages 5 to 14: 6.9 percent male, 6.3 percent female; ages 15 to 34: 7.2 percent male, 10.7 percent female). CDC's own surveillance summary states that current asthma prevalence for children aged 5 to 14 years was higher for males than for females, while among adults 35 years and older, current asthma prevalence was higher for females than males .
The pubertal timing is supported in the peer-reviewed literature. A Vanderbilt review states that sex-related differences in asthma prevalence are well established and change through the reproductive phases of life: as children, boys have increased prevalence compared to girls, but as adults, women have increased prevalence compared to men . A second review notes that the switch in asthma prevalence from highest in males to highest in females coincided with the age of puberty onset . Longitudinal cohort work found that in the TRAILS study, asthma prevalence was similar in boys and girls at a mean age of 11.1, but by age 16.3 prevalence was significantly higher in females than males .
On the hormone mechanism, the National Geographic piece reports expert framing that female hormones like estradiol tend to be more pro-inflammatory while androgens tend to be more anti-inflammatory . This is an active research area rather than settled causal explanation.
Findings
✓ What's accurate 4
- "About one in 10 women in the U.S. has asthma": supported. Adult female current asthma prevalence is 9.8 percent (NHIS 2021) to 10.8 percent (NHIS 2022).
- "Before puberty, boys are more likely to have asthma": supported. Male children exceed female children in every recent CDC dataset, most sharply in the 5 to 14 age band.
- "After puberty, that pattern reverses": supported by both NHIS age-stratified tables and multiple peer-reviewed longitudinal cohorts.
- "Researchers are getting closer to understanding that shift, including how hormones such as estrogen can influence airway inflammation and severity": supported as a description of an active research field. The post uses appropriately hedged language ("getting closer," "can influence") rather than claiming a settled mechanism.
≈ What's misleading 2
- "Nearly twice the rate among men": mild exaggeration. The actual ratio in the strongest current sources is roughly 1.6 to 1.7 times, not close to 2. The 1.76 figure from 2017-2018 age-adjusted data is the friendliest to the phrasing, but the most recent CDC data puts it at about 1.66. Describing a 66 percent difference as "nearly twice" rounds upward in a way that overstates the gap by a noticeable margin. This is a rounding and magnitude imprecision rather than a fabrication.
- Implied precision of the puberty threshold: CDC data groups ages as 5 to 14 and 15 to 34, so the crossover is inferred from broad age bands rather than measured against individual pubertal staging. Some research finds the switch is not cleanly tied to Tanner stage. One cohort study reported that despite identifying the hypothesized gender switch in asthma prevalence, no association was observed between pubertal stages and asthma prevalence . The clean "before puberty / after puberty" framing is a simplification.
? What's uncertain 3
- Whether the adult sex gap reflects true biological difference in disease, differences in symptom reporting and healthcare seeking, or diagnostic bias. Prevalence is measured by self-reported physician diagnosis, not objective lung function testing. Literature notes that women generally report more severe asthma symptoms than men, and implicit gender bias by healthcare professionals may result in delayed asthma diagnosis . This cuts in multiple directions and is not resolved.
- The causal role of estrogen specifically. Much of the mechanistic evidence comes from animal models. One cited study used ovariectomized BALB/c mice implanted with subcutaneous estrogen or placebo pellets, followed by ovalbumin sensitization and challenge . The post does not overclaim here, but readers should understand the mechanism is not established in humans.
- Whether newer 2023 or 2024 NHIS figures shift the ratio. The most recent complete sex-stratified national table located was 2022.
Sources
8 of 8 linked to recordsCDC "Most Recent Asthma Data" national tables, NHIS 2022
CDC Preventing Chronic Disease, "The Status of Asthma in the United States" (2024, NHIS 2021 data)
CDC NHIS asthma prevalence tables by age and sex, 2019 and 2020 (Table 4-1)
NCHS QuickStats, NHIS 2017-2018, age-adjusted adult asthma by sex
American Lung Association Asthma Trends Brief, current demographics
Shah & Newcomb, "Sex Bias in Asthma Prevalence and Pathogenesis," Frontiers in Immunology 2018
Fuseini & Newcomb, "Mechanisms driving gender differences in asthma"
National Geographic, "Asthma Is Worse for Women. Doctors Are Finally Starting to Figure Out Why."