Since the sightings stopped after the bridge collapse, and one sighting was over the bridge just before the collapse, some paranormal investigators theorize that the mothman was actually some type of psychic projection.
However, many experts theorize that environmental factors may play a role, triggering the disorder in those with certain genetic vulnerabilities.
Some researchers theorize that pollutants in the environment may interact with genetic weaknesses to trigger ASD.
Because of this, many researchers theorize that migraines are caused by an overabundance of naturally occurring brain substances that that cause blood vessels to swell and press on nerves in the head.
Some protesters of clay litters even theorize that bentonite can coat the intestines, preventing the absorption of nutrients and causing an overgrowth of unhealthy bacteria.