Mercury exposure poses severe health risks, particularly affecting the nervous system. Methylmercury, the most toxic form, is known to impair brain development in fetuses and young children. Adults can experience symptoms such as memory loss, cognitive dysfunction, and motor skill impairment. Prolonged exposure can also harm the kidneys and cardiovascular system. Populations relying heavily on fish and seafood are at greater risk due to higher levels of methylmercury in these foods.