Headache, tinnitus and hearing loss in the international Cohort Study of Mobile Phone Use and Health (COSMOS) in Sweden and Finland.

Similarly, the Danish study indicated an association of borderline significance between maternal mobile phone use during pregnancy and hearing loss in children at age 7 years, but the authors were cautious about drawing inference due to potential biases. 37 A large Danish cohort study reported 10–20% higher rates of hospitalizations and outpatient visits for migraine among mobile phone subscribers, especially those with a recent subscription. 13 This result was difficult to interpret and may reflect reverse causation, i.e. people with migraine being more likely to use a mobile phone.

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