Arsenic is a substance found naturally in some ground water and may lead to arsenic poisoning in some regions.
There are people in over 70 countries that have elevated levels of arsenic due to the natural levels in their ground water.
Diarrhea, confusion and headaches are some of the early symptoms of arsenic poisoning. Later convulsions, vomiting, bloody urine, hair loss, cramping and white blotching on fingernails can start to manifest themselves. Night blindness is also a sign that you may be exposed to too much arsenic.
Arsenic can be measured in a person's system through tests of the urine, blood or hair.