In recent years, although the medical community has conducted a lot of research on this topic, the results have been inconsistent. Therefore, there is still controversy over whether using mobile phones is truly associated with cancer, especially brain tumors.
In a 20-year follow-up study of 420,000 mobile phone users, researchers found that using mobile phones did not increase the risk of brain tumors. However, another study showed that long-term frequent use of mobile phones increased the risk of glioma (a type of brain tumor), although it did not affect other types of brain tumors. Another study found that mobile phone use might increase the risk of salivary gland cancer, but because very few participants in this study developed malignant tumors, and some of them were regular smokers (smoking is a known risk factor for salivary gland cancer), the results may not be reliable.
In general, determining the risk factors for a disease often takes many years. So far, the history of mobile phone use is relatively short, and no definitive conclusions can be drawn. If you are concerned that using a mobile phone may increase the risk of cancer, you can reduce the time you spend on your phone or use speakerphone, hands-free devices, or headphones, so the phone itself does not need to be close to your head.