Most people experience an emotional response that floods their body with stress hormones when they hear their phone go off, according to Cheever. People also responded with symptoms of stress and anxiety when their phones were taken away from them during the experiment and they could hear them ring. Other previous studies found a greater risk for children to for developing brain cancer from cell phones. Mobile phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues close to the phone.
In 2011, International Agency for Research on Cancer classified mobile phone radiation possibly carcinogenic, means that there “could be some risk” of carcinogenicity. The evidence is not strong enough to be considered causal and needs to be investigated further. Scientists have reported adverse health effects of using mobile phones including changes in brain activity, reaction times, and sleep patterns. The FDA suggested the use of cell phones for shorter conversations or for times when a landline phone is not available or at least a hands-free device, which places more distance between the phone and the head of the user.In many countries, over half of the population use mobile phones and the mobile phone market is growing rapidly.