Mercury toxicity occurs when excessive amounts of mercury, a heavy metal, accumulate in the body. This can happen through exposure to contaminated fish, industrial emissions, or certain medical products. Symptoms may include tremors, memory problems, and mood changes, affecting both physical and mental health. There are different forms of mercury, including methylmercury and elemental mercury, each with varying levels of toxicity. Pregnant women and young children are particularly vulnerable, as mercury can harm fetal development and cognitive function. Reducing exposure through dietary choices and environmental regulations is essential for prevention.