Mercury exposure occurs when individuals come into contact with mercury, a toxic heavy metal found in various forms, including elemental mercury, inorganic mercury compounds, and organic mercury compounds like methylmercury. Common sources of exposure include certain fish, industrial processes, and broken thermometers. Health effects of mercury exposure can vary based on the type and amount of mercury, as well as the duration of exposure. Symptoms may include neurological issues, cognitive impairments, and damage to the kidneys and lungs. Pregnant women and young children are particularly vulnerable to the harmful effects of mercury.