Microwave radiation won't cause cancer, it just heats food up.

Only a few types of radiation cause cancer, and these depend on the dose. Radiation from the sun can cause skin cancer, for example, but just enough helps your body make Vitamin D, too.

Microwaves also won't disrupt a pacemaker. However, things like anti-theft systems, metal detectors, powerful refrigerator magnets, mobile phones, and even headphones can mess with the heartbeat-keeping devices.