From lung cancer to heart disease, air pollution is known to be associated with a range of health issues.
Now, research has revealed that exposure to high levels of smog can also increase the risk of painful periods for women.
Scientists from China Medical University Hospital in Taiwan have shown that long-term exposure to air pollutants can greatly increase the risk of dysmenorrhea – frequent severe and painful cramps – in women.
Shockingly, their research found that women who live in areas with the highest levels of air pollutants are 33 times more likely to develop the condition than women living in areas with in lower levels.
Professor Chung Y. Hsu, one of the authors of the study, said: ‘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.’
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Scientists from China Medical University Hospital in Taiwan have shown that long-term exposure to air pollutants can greatly increase the risk of dysmenorrhea – frequent severe and painful cramps – in women (stock image)
Dysmenorrhea is the most common of all gynaecological disorders, and is associated with cramping pain in the lower abdomen before or during menstruation.
The National Institute for Health and Care Excellence (NICE) explained: ‘Dysmenorrhoea is common. Prevalence rates vary widely in the literature and range from 16–91% in women of reproductive age.’
The condition can be due to hormonal imbalances, or may be linked to other underlying gynaecological conditions such as endometriosis, fibroids or pelvic inflammatory disease.
While dysmenorrhea has no known cure, its symptoms can usually be managed with anti-inflammatory drugs.
In the study, the researchers set out to understand whether the condition has any link to air pollution.
Professor Hsu said: ‘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.’
The team analysed data from 296,078 women aged 16-55 in Taiwan with no record of dysmenorrhea before 2000.
The data included information on their long-term exposure to air pollutants including nitrogen oxide, nitric oxide, nitrogen dioxide, carbon monoxide and PM2.5, based on their address.
In the study, the researchers set out to understand whether dysmenorrhea has any link to air pollution (stock image)
Their analysis revealed that from 2000 to 2013, 4.2 per cent of the women were diagnosed with dysmenorrhea.
As expected based on previous studies, younger women, women of lower incomes, and those living in more urbanised areas tended to have a higher risk of developing dysmenorrhea.
However, the data also revealed that for women living in the 25 per cent of areas with the highest levels of air pollution, the risk of dysmenorrhea was 16.7 to 33.1 times higher than for women in the 25 per cent of areas with the lowest exposure.
In particular, women exposed to high PM2.5 were found to be at the highest risk for dysmenorrhea.
‘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,’ Professor Hsu added.
‘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.’