A large review of 28 studies suggests that people with allergic diseases may have a slightly higher overall risk of developing cancer, though the increase is small. Researchers found the strongest association in people with asthma, while hay fever and atopic dermatitis showed no significant link. The relationship also varied by region and cancer type, with some cancers showing increased risk and others showing the opposite trend. Importantly, the findings do not prove that allergies cause cancer. Experts say more research is needed to understand the biological connection and identify which groups, if any, may face a meaningful increase in risk.
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