Mercury poisoning occurs when a person is exposed to high levels of mercury, a toxic heavy metal. This can happen through consumption of contaminated fish, inhalation of mercury vapors, or contact with mercury-containing products. Symptoms may include tremors, memory problems, and mood changes, affecting both physical and mental health. The effects of mercury poisoning can vary depending on the type of mercury and the level of exposure. Methylmercury, commonly found in fish, is particularly harmful, especially to developing fetuses and young children. Early detection and treatment are crucial to prevent long-term damage.