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Terminally ill 29-year-old to end her life dating someone with terminal cancerAt very dting levels, RF waves can heat up body tissues. But the levels of energy given off by cell phones are much lower, and are not enough to raise temperatures in the body. The waves are strongest at the antenna and lose energy quickly as they travel away from the phone.
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The phone is often held against the head when a person is on a call. The closer the antenna is to a user's head, the greater their expected exposure to RF waves. The body tissues closest to the phone absorb more energy from RF waves than tissues farther away. Many factors can affect the amount of energy from RF waves that a person is exposed to, including:.
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Different cell phones have different SAR levels. The listed SAR value is based only on the phone operating at its highest power, not on what users would typically be exposed to with normal phone 4o plus. Because cell phones usually are held near the head when a cance is on a call, the main concern has been whether the phones might cause or contribute to tumors in this area, including:.
In most cases neither type of study provides enough evidence on its own to show if something causes cancer in people, so researchers usually look at both lab-based and human studies.
The following is a brief summary of some cacer the major studies that have looked at this issue to date. However, this is not a comprehensive review of all studies that have been done. Some studies have found possible increased rates of certain types of tumors in lab animals exposed to RF radiation, but overall, the results of these types of studies have not provided clear answers so far.
Large studies published in by the US National Toxicology Program NTP and by the Ramazzini Institute in Italy exposed groups of lab rats as well as mice, in the case of the NTP study to RF waves over their entire bodies for many hours somene day, starting before birth and continuing for most or all of their natural lives. Both studies found an increased risk of uncommon heart tumors called malignant schwannomas in male rats, but not in female rats nor in male or female mice, in the NTP study.]
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