Thallium is an inorganic compound introduced into the water supply by leaching from ore processing plants, as well as discharge from electronics, glass and drug factories, and as a compound in rat poison. Thallium poisoning due to the ingestion of large quantities, as in rat poison, will result in stomach discomfort, potentially permanent damage to the nervous system and even death. Thallium easily accumulates in the human body, so its chronic effects could consist of tiredness, headaches, depression, lack of appetite, leg pains, hair loss, nerve and joint pains, and sight problems. It has also been linked to hair loss, changes in blood and kidneys, and also intestine and liver problems.

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