Haunted Houses and Carbon Monoxide

Symptoms of Carbon Monoxide poisoning include listlessness, depression, dementia, emotional disturbances and hallucinations. Many of the phenomena generally associated with haunted houses including strange visions and sounds, feelings of dread, illness and the sudden apparent inexplicable deeath of all the occupants can be attributed to carbon monoxide poisoning.

In one famous case, carbon monoxide poisoning was clearly identified as the cause of an alleged haunting.Dr. William Wilmer, an ophthalmologist, described the experiences of one of his patients in a 1921 article published in the American Journal of Ophthalmology. "Mr. and Mrs. H." moved into a new home, but soon began to complain of headaches and listlessness. They began to hear bells and footsteps during the night, soon accompanied by strange physical sensations and mysterious figures. When they began to investigate, they found the previous residents had experienced similar symptoms. Upon examination, their furnace was found to be severely damaged, resulting in incomplete combustion and forcing most of the fumes into the house rather than up the chimney.After the stove was fixed, the family fully recovered and did not experience any further unusual events. A report published in 2005 described a 23 year old female victim of CMP found  delirious and hyperventilating who claimed to have seen a ghost while in the shower. A new gas appliance had just been installed in her home improperly which flooded the house with carbon monoxide when the victim closed all the exterior windows and doors and took a shower.

Carbon Monoxide is the leading cause of accidental poisoning deaths in North America, thus carbon monoxide poisoning should be promptly investigated as a possible cause for "hauntings."

Source: Wikipedia