Health
Study Links Hormonal IUDs to Slightly Increased Breast Cancer Risk in Young Women
Copenhagen, Denmark — A recent study from the Danish Cancer Institute has found that hormone-releasing intrauterine devices (IUDs) may be associated with a slightly higher risk of breast cancer among young women. The large-scale study, published in the Journal of the American Medical Association (JAMA), has prompted health professionals to reconsider the risks and benefits of hormonal contraceptives.
The research examined health outcomes for around 79,000 women, aged 15 to 49, who used hormonal IUDs, such as the Mirena coil, compared to a similar group of women who did not use any form of hormonal birth control. The women were monitored over an average of 6.8 years. While the overall risk of developing breast cancer remained low, the study found that hormonal IUD users faced a slightly higher risk—about 14 additional cases of breast cancer per 10,000 women.
Hormonal IUDs, which release a progesterone-like hormone to prevent pregnancy, are commonly used across Europe, with about 8.1% of reproductive-age women relying on this form of contraception. Unlike copper IUDs, which do not involve hormones, devices like the Mirena coil work by slowly releasing hormones directly into the uterus. Many medical professionals had previously believed this localized hormone release posed a lower risk of breast cancer compared to oral contraceptive pills, which expose the body to higher levels of hormones.
However, the new findings challenge this assumption. “The results of this study are highly unexpected,” said Dr. Channa Jayasena, a reproductive endocrinologist at Imperial College London, who was not involved in the research.
The study has limitations, as it did not account for lifestyle factors like smoking, alcohol consumption, and obesity, all of which are known breast cancer risk factors. These unmeasured variables could influence the study’s results, but the data has nonetheless raised concerns.
Doctors and researchers are now advising that healthcare providers include potential breast cancer risks when discussing hormonal IUDs with patients. “My advice for women is that breast cancer risk caused by [IUDs] is not established but warrants a closer look,” Jayasena added.
This is not the first study to suggest a link between hormonal contraceptives and breast cancer. Last year, researchers at the University of Oxford found that progestogen-only contraceptives, regardless of their form, were associated with a slight increase in breast cancer risk. Experts suggest that the increased risk from IUDs may be similar to that posed by oral contraceptives.
Despite the findings, there remains broad medical consensus that the benefits of hormonal contraception outweigh the risks. Dr. Mangesh Thorat, a breast cancer surgeon and researcher at Queen Mary University of London, noted that certain types of IUDs have been shown to reduce the risks of cervical, endometrial, and ovarian cancers.
Thorat also highlighted that contraceptive risks change with age, suggesting that women nearing 40 should consider non-hormonal alternatives in consultation with their healthcare providers.
Health
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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Health
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