Manganism is a condition caused by prolonged exposure to manganese, a naturally occurring element found in soil, rocks, and water. The symptoms of manganism include tremors, muscle rigidity, and difficulty with balance and coordination. Some synonyms for manganism include manganese toxicity, manganese poisoning, and chronic manganese poisoning. Other terms used to describe the condition include welder's disease, because it is common among welders who inhale manganese fumes, and parkinsonism, because the symptoms are similar to those of Parkinson's disease. While there is no cure for manganism, it can be prevented by limiting exposure to manganese in the workplace and through proper protective equipment and ventilation.