Simply put, health care providers should ask their patients if they eat fish. Methylmercury poisoning has been called the great masquerader as the symptoms to first manifest in high-mercury fish eaters are common to other conditions. Fish eaters should be advised to choose low mercury fish most often in order to obtain the most benefits from fish while minimizing risks from methylmercury and persistent organic contaminants. Recent press regarding cardiovascular effects and methylmercury ignore the neurological and immunological health effects that methylmercury and persistent organic pollutants can have, particularly for sensitive individuals. The resources below provide useful information for physicians about methylmercury exposure from fish consumption.