Arsenic poisoning tends to occur most often in areas of industrialization, whether you work or live there. Countries that have high levels of arsenic-containing groundwater include the United States, India, China, and Mexico. Long-term exposure to arsenic can cause more severe symptoms. You should seek emergency help if you experience any of the following after a suspected arsenic exposure:

darkening skin
constant sore throat
persistent digestive issues

According to the World Health Organization, long-term symptoms tend to occur in the skin first, and can show up within five years of exposure. Cases of extreme poisoning may lead to death. Contaminated groundwater is the most common cause of arsenic poisoning. Arsenic is already present in the earth and can seep into groundwater. Also, groundwater can contain runoff from industrial plants. Drinking arsenic-laden water over a long period of time can lead to poisoning.

Ground water continues to be the most common source of arsenic poisoning. One of the most effective preventive measures against arsenic poisoning is to make sure you drink clean, filtered water. You can also make sure that all foods are prepared in clean water.

If you work in industries that use arsenic, take extra precautions. Bring your own water from home, and wear a mask to reduce accidental arsenic inhalation. While traveling, consider drinking bottled water only.

Chemistry Lesson of the Day: A spy was poisoned with a trace of polonium in his tea. It took 23 days for him to die. Polonium is not an element you want to mess around without dangerous profit intent or smart forces spreading strategic fear, hate and wars.