Normally mercury poisoning does not cause fever in patients, because mercury mainly produces toxic effects on the blood system, tissue cells. In general, mercury poisoning does not cause fever, but mainly produces damage to the liver, kidneys, blood system, or damage to the nervous system and reactions of the gastrointestinal tract. The main cause of mercury poisoning is the combination of heavy metals with oxidative respiratory chains and biological enzymes in the cellular structure of tissues, resulting in irreversible damage and inactivation of proteases in the body. Therefore, mercury poisoning produces severe symptoms of poisoning, which produce damage to the liver, kidneys, heart, nervous system, and blood system.