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Causes of Autism

List of causes of Autism

Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Autism) that could possibly cause Autism includes:

Autism Causes: Risk Factors

The following conditions have been cited in various sources as potentially causal risk factors related to Autism:

Autism Causes: Male-Female Gender Ratio

Gender of Patients for Autism: 4 times more common in males than females...more »

Gender Profile of Autism: Autism is about 4 times more common in boys than girls. Girls with the disorder, however, tend to have... (Source: excerpt from The Numbers Count: NIMH) ...more »

Autism: Related Medical Conditions

To research the causes of Autism, consider researching the causes of these these diseases that may be similar, or associated with Autism:

Autism: Causes and Types

Causes of Types of Autism: Review the cause informationfor the various types of Autism:

Causes of Broader Categories of Autism: Review the causal information about the various more general categories of medical conditions:

Autism as a symptom:

Conditions listing Autism as a symptom may also be potential underlying causes of Autism. Our database lists the following as having Autism as a symptom of that condition:

What causes Autism?

Causes: Autism: Autism has no single cause. Researchers have identified a number of genes that play a role in the disorder. In some children, environmental factors also may play a role in development of the disorder. Studies of people with autism have found abnormalities in several regions of the brain, including the cerebellum, amygdala, hippocampus, septum, and mamillary bodies. Neurons in these regions appear smaller than normal and have stunted nerve fibers, which may interfere with nerve signaling. These abnormalities suggest that autism results from disruption of normal brain development early in fetal development. Other studies suggest that people with autism have abnormalities of serotonin or other signaling molecules in the brain. While these findings are intriguing, they are preliminary and require further study. The early belief that parental practices are responsible for autism has now been disproved. (Source: excerpt from Autism Fact Sheet: NINDS)
Article excerpts about the causes of Autism:
It is generally accepted that autism is caused by abnormalities in brain structures or functions. Using a variety of new research tools to study human and animal brain growth, scientists are discovering more about normal development and how abnormalities occur.

The brain of a fetus develops throughout pregnancy. Starting out with a few cells, the cells grow and divide until the brain contains billions of specialized cells, called neurons. Research sponsored by NIMH and other components at the National Institutes of Health is playing a key role in showing how cells find their way to a specific area of the brain and take on special functions. Once in place, each neuron sends out long fibers that connect with other neurons. In this way, lines of communication are established between various areas of the brain and between the brain and the rest of the body. As each neuron receives a signal it releases chemicals called neurotransmitters, which pass the signal to the next neuron. By birth, the brain has evolved into a complex organ with several distinct regions and subregions, each with a precise set of functions and responsibilities. (Source: excerpt from Autism: NIMH)

Medical news summaries relating to Autism:

The following medical news items are relevant to causes of Autism:

Related information on causes of Autism:

As with all medical conditions, there may be many causal factors. Further relevant information on causes of Autism may be found in:


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