<P> While various studies have shown high concentrations of mercury accumulated in fish, medical cases often go unreported and pose a difficulty in correlating mercury in fish with human poisoning . Environmental issues cover a broad range of areas, but medical cases that are associated with pollutants released into the environment by factories or construction areas cause public health issues that affect not only the environment but also human well - being . Substances poisonous to the human body in a particular amount or dose may not cause any symptoms over time . While there are limits to how much of anything the body can have, mercury is a particular poison that produces immediate physical symptoms when the body has been accumulating it over a period of time . </P> <P> In the United States, the Environmental Protection Agency measures the amount of mercury concentrated in human blood that does not pose fatal health outcomes . The agency is in charge of enforcing regulations and policies that cover a range of environmental topics . Analysis of blood mercury concentrations in childbearing women has proved that exposure to methyl mercury (MeHg) occurs primarily through the consumption of fish . The U.S. FDA highly recommends against pregnant woman and young children consuming raw fish . Pregnant women and young children often lack strong immune systems and are more at risk for foodborne illnesses . </P> <P> In the United States, the EPA serves as an advisory organ to set the levels of mercury that are non-fatal in humans . Symptoms of exposure to high levels of methyl mercury include disturbed vision, hearing, and speech, lack of coordination, and muscle weakness . Medical studies have examined the correlation of fish consumption and health issues . American studies have presented evidence of fish consumption and its effects on child development . Longitudinal studies agree that human activities are what release and accumulate mercury in marine life . Addressing the issues of fish consumption forces health officials to recognize the sources of mercury in the human body . Specific Native American tribes are vulnerable to a high exposure of mercury . Studies have determined that these native peoples in the United States suffer more from mercury poisoning and illness than any other cohort group in the country . This is due to the fact that fish is a main source of protein . Exposure risk was assessed through a medical study, thus raising judicial issues of whether the public health of these groups is a priority in the United States . </P> <P> Most cases that arise are due to work exposure or medicinal poisoning . Environmental justice advocates can relate these mercury cases to the unregulated amount of mercury that enters the environment . Workers can be exposed to mercury through the manufacture of fluorescent tubes, chloralkali, or acetaldehyde among other products . Anthropogenic sources and places where mercury is released or used as a solid or vapor puts these has caused fatigue, dizziness, hyperhidrosis, chest congestion, and loss of motor skills . When taken to the hospital, the neurotoxicity levels had already exceeded the maximum amounts . Over-the - counter medicines have been shown to have traces of mercurous choloride . Medical research reported that the children who received doses of these medicines experienced physical symptoms such as "drooling, irregular arm movements, and impaired gait". Exposures to this result in severe physical impairments unregulated chemicals that are put in products . The intake of laxatives that contained about 120 mg of mercurous chloride has also been cases of mercury's toxicity . </P>

Mercury has been directly linked to which of the following health problems in humans