- NEW YORK (Reuters
Health) - Norwegian and Swedish users of mobile phones commonly report
headaches, warmth on the ear and burning sensations of the facial skin,
according to a report published in a recent issue of the journal Occupational
- Dr. Gunnhild Oftedal, of the Norwegian University of
Science and Technology in Trondheim, and colleagues in Sweden sent a questionnaire
to 12,000 people in Sweden and 5,000 in Norway who use mobile phones as
part of their job. In Sweden, 7,803 people responded, and in Norway there
were 2,828 respondents.
- Among the Norwegians, 31% experienced at least one symptom,
while among the Swedish respondents, 13% reported one or more symptoms
associated with mobile phone use. The researchers account for this difference
by noting differences in the response rate and population characteristics
between the two groups. They also point out that the reported symptoms
were similar for both groups.
- ``The warmth sensations were predominately experienced
during the mobile phone call. Other symptoms, like headaches, most often
began during or within half an hour after the call and usually lasted for
up to 2 hours,'' according to the report.
- Among the Norwegians, the investigators found that, depending
on the symptom, 48% to 78% ``indicated that the phone call had to be 5
minutes or longer to provoke the symptoms.'' Similarly, 38% to 68% of the
Swedish participants reported that symptoms developed after 5 minutes or
longer. Other factors related to symptom onset for subjects in both countries
were stress conditions (16%) and difficulty hearing (10%).
- Most of the respondents had not seen a physician, but
about 45% had taken steps to relieve their symptoms. The most common strategies
for symptom relief, according to the researchers, were reducing the duration
of calls and using ``hands free equipment.'' They add that ``most people
experienced a reduction of the symptom as a result of the reported steps.''
- ``The fact that people experience a symptom, or become
aware of a symptom during or shortly after a phone call, does not necessarily
imply a causal relation between the use of the mobile phone and the symptom,''
Oftedal and colleagues caution. They also add that the study findings ``can
not be generalized to all mobile phone users.''
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