I was trying to find an answer for this earlier and the best thing I found was:
Your muscles stop working when you die, so your bladder empties and stuff like that, because the muscles holding and controlling that stuff quit.
In the same way, the muscle preventing backflow from your stomach into your mouth quits too, allowing stomach acid into your mouth.
I read somewhere else foam is made from a mixture of chemicals and substances and when it hits air it bubbles.
SO. I'm concluding that as the person's dying, one by one their muscles slow/quit (I'm assuming heart and brain would be last to shut down).
When the muscle controlling the stomach stops, acid goes up into your mouth, mixed with whatever they overdosed on, making the foam. Air hits it, causing it to bubble and bubble up to where you can visibly see it on their lips.
It could, but there are other causes also
yes, i seen it,
yes
It could mean drug overdose or dehydrated.
drug overdose
Yes
how one can identify overdose
He died of a drug overdose. :(
David Kennedy, a son of RFK, died in 1984 of a drug overdose
12848574646575 about this much i think
In 2005 there were a total of 33,541 drug induced deaths.
Yes, a drug overdose will cause death if medical intervention is not sought in good time.
If the person shows no signs of life from a drug overdose, yes you would perform CPR.
He fell victim of a drug overdose while celebrating his return to music
He died of a barbiturate overdose (sleeping pills)