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Fertility & Pregnancy News

Long-term Exposure to Air Pollutants Increases the Risk of Dysmenorrhea in Women

July 10, 2021 By Namita Nayyar (WF Team)

Dysmenorrhea can be due to hormonal imbalances or to underlying gynecological conditions such as endometriosis, pelvic inflammatory disease, ectopic pregnancy, or tumors in the pelvic cavity. Symptoms are often life-long: they include cramps and pain in the lower abdomen, pain in the lower back and legs, nausea and vomiting, diarrhea, fainting, weakness, fatigue, and headaches. In addition to reducing quality of life, dysmenorrhea also has a major socioeconomic impact, as females with dysmenorrhea may be temporarily unable to work, attend school, or engage in leisure activities. Dysmenorrhea has no known cure, but its symptoms may be managed with anti-inflammatory drugs and hormonal contraceptives.

“Research has already shown that women who smoke or drink alcohol during their periods, or who are overweight, or have their first period very young, run a greater risk of dysmenorrhea. Women who have never been pregnant are likewise known to be at greater risk. But here we demonstrate for the first time another important risk factor for developing dysmenorrhea: air quality, in particular long-term exposure to pollution. We don’t yet know the underlying mechanism, but emotional stress in women exposed to air pollutants, or higher average levels of the hormone-like prostaglandins in their body, might be part of the answer,” says one of the authors, Prof Chung Y. Hsu at the College of Medicine, China Medical University, Taichung, Taiwan.

The authors, led by Prof Chia-Hung Kao, the Director of the department of nuclear medicine and the Center for Positron Emission Tomography (PET) at China Medical University, studied de-identified health measures from a total of 296,078 women and girls (approximately 1.3% of the total population) between 16-55 years old. These data came from Taiwan’s Longitudinal Health Insurance Database starting 2000 (LHID 2000), a representative subsample from Taiwan’s nation-wide health insurance database.

The study sample exclusively included women and girls without any recorded history of dysmenorrhea before 2000. The authors looked for a long-term association between the risk of dysmenorrhea and air quality, in particular the mean exposure over the years to air pollutants – nitrogen oxide (NOx), nitric oxide (NO), nitrogen dioxide (NO2), carbon monoxide (CO), and particles smaller than 2.5 μm in diameter (‘PM2.5’) – obtained from the ‘Taiwan Air Quality Monitoring Database’ (TAQMD) of the Environmental Protection Agency.

Air pollutants are an important new risk factor
They found that from 2000- to 2013, 4.2% of women and girls in the studied sample were diagnosed with dysmenorrhea for the first time. As was expected from previous studies, younger women, women of lower incomes, and living in more urbanized areas tended to have a higher risk of developing dysmenorrhea over the study period. But importantly, the ‘hazard ratio’ (that is, the age- and year-specific risk) of developing dysmenorrhea increased by 16.7 to 33.1 fold for women and girls from the 25% of areas with the highest yearly exposure to air pollutants, compared to those from the 25% of areas with the lowest exposure. NOx, NO, NO2, CO, and PM2.5 levels each contributed separately to the increased risk, but the greatest individual effect was from long-term exposure to high PM2.5.

“Our results study demonstrate the major impact of the quality of air on human health in general, here specifically on the risk of dysmenorrhea in women and girls. This is a clear illustration of the need to for actions by governmental agencies and citizens to reduce air pollution, in order to improve human health,” concludes Prof Hsu.

source: https://www.news-medical.net/

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