Arsenic is a naturally occurring element found in soil and water that can accumulate in the human body. Small amounts may be essential, but inorganic forms are toxic and can damage organs like the skin, hair, nails, and kidneys. Long term low-level exposure to arsenic through drinking water or food has been linked to health issues and increased mortality. Common symptoms of arsenic toxicity include hair loss, skin problems, fatigue, and damage to blood, nerves, liver and kidneys. Testing arsenic levels can help determine contamination in the body.