It must be noted that tumors are crude indicators of harmful effects on the brain. It takes a considerable impact and a long exposure to damaging influences to cause cancer. If even such a pronounced derangement of cellular functioning may develop, there are strong reasons to believe that many subtle and delicate processess may be affected to an important extent. An expression of such effects are disturbances of brain waves and sleep that have been demonstrated in some studies (see below). Science knows much to little yet to be able to fully assess the impact of microwaves on the brain.
mobile phone and mast microwaves emit a kind of pulsing white noise that interferes with our bodies in the same way that phones interfere with aeroplane or hospital equipment.