What would cause foam to come out of a dead persons nose or mouth?
Foam does come out of person's mouth in many cases..If a person swallows insecticide as a suicide or is forced to swallow it by someone, large amount of foam is emitted from mouth..A victim of rabies..often froths from his mouth and dies in the same condition with releasing all foam on his pillow too..A person bitten by a snake, gets paralyzed and is unable to breathe because of which his mouth emits foam..since he gasps for air and froths his saliva..A person who has died of seizure will have foam around his mouth..Drug overdoses also cause victim's mouth to foam..Chemical poisons, if ingested, irritate the stomach and react with acids which come out as lot of foam from person's mouth..If someone is strangled or choked..saliva drools out of his mouthDrowning also causes it..
Drowning is one of the reasons that would cause foam to come out of a dead person's nose or mouth. This happens because the lungs are being filled with fluid during asphyxia. For more information, please see: http://www.mitchpileggi.net/Deep_Background/resources/forensics/bodies.htm#Causedeath.
When a person is deceased many times you will see the release of various bodily fluids. Foam coming out of a dead person's mouth or nose could be due to pulmonary edema. This is a build up of fluid and air in the lungs.