1) Medical Conditions;
2) Brain Damage;
3) Genetic Conditions;
4) Psychiatric Conditions.
Four conditions are the most common causes of ID (www.thearc.org). First, there is autism. This is a psychiatric cause. Next are two genetic conditions. These are Down syndrome and Fragile X syndrome. Lastly, Fetal Alcohol Syndrome (FAS) is a medical condition. However, among these common causes, only FAS is completely preventable.
Medical Causes of Intellectual Disabilities
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Pre- and post-natal exposure to alcohol, drugs, toxins, and certain infections can have a devastating effect on brain development. This exposure can result in physical and mental defects, and even death of an infant.
Prenatal exposure to alcohol and other drugs
Fetal Alcohol Syndrome (FAS) is one of the leading causes of preventable birth defects and intellectual disabilities (source: The American College of Obstetricians and Gynecologist). Alcohol passes directly from the blood stream of a pregnant woman, through the placenta, to the developing fetus' brain. It is not clear how much alcohol is safe. Therefore, most doctors recommend pregnant women avoid alcohol. Even drinking three drinks a day during pregnancy can cause fetal alcohol syndrome (FAS). Other drugs also harm a developing fetus. This includes nicotine, cocaine, and heroin. A pregnant woman should tell her doctor if she uses alcohol or drugs. Her doctor may be able to help her reduce the risks to her unborn child.
Environmental exposure to toxins
Pre- and post-natal exposure to toxins can cause intellectual disabilities. Of particular concern are lead, mercury, and radiation. Avoiding exposure to these toxins reduces the risk of developing an intellectual disability.
Mercury is found in polluted waters. Fish that swim in these waters contain mercury. Large fish such as shark, mackerel, and swordfish contain higher amounts of mercury. Because large fish live longer, the mercury builds up to higher levels. When women consume these large fish, the mercury can pass through the placenta, and to the fetus. Women can reduce this risk by switching to low mercury fish. Low mercury fish are smaller. This includes shrimp, salmon, and Pollack. Some farm-raised fish are also safer than ocean dwelling fish.
Lead based paints are present in pre-1970s homes and in the soil surrounding older homes. Families can find lead abatement programs through their county and state public services.
High radiation exposure is associated with intellectual disabilities. Fortunately, modern radiation equipment has drastically reduced the amount of radiation exposure. However, it is uncertain what a safe level of exposure is. For this reason, women who may be pregnant should speak up before receiving any radiation procedures.
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