Electromagnetic fields, or EMF for short, have been known to play a role in suspected paranormal activity. EMF occur naturally in the world, but manmade devices create stronger fields that some believe may pose health problems for humans. Electrical fields surround any device that runs current, and an electrical field may be present even when the current is turned off. Humans exposed to high level of EMF have reported a variety of symptoms ranging from headaches, dizziness, and nausea, to anxiety, depression, and fatigue. You may also have a feeling of being watched or just general paranoia or even have hallucinations. Old wiring in basements or attics, refrigerators, microwave ovens, televisions and even clock radios have been known to give off high levels of EMF. Cumulative, long term exposure to EMF is not healthy. If you experience any of these symptoms, you should check for high EMF with a meter specifically designed to detect EMF levels.