Symptoms of autism usually appear during the first three years of life. Autism affects an estimated 2 to 10 of every 10,000 people. Autism is four times more likely to strike males than females, and it has been found throughout the world in people of all social and racial backgrounds. Autism has no single cause. Researchers believe several genes as well as environmental factors such as viruses or chemicals, contribute to the disorder.
Recent studies suggest that some people have a genetic predisposition to autism.
Researchers continue to look for clues about which genes contribute to autism, and increased susceptibility to autism. Although there is currently no cure for autism, many therapies and interventions have been found to remedy specific symptoms. Although these interventions do not cure autism, they often bring about substantial improvement. IBS is a syndrome rather than a disease. It is not a life-threatening disorder.