"Autism has no single defined cause. It's a multifactorial cause. It can be related to genetic factors as well as environmental factors, it tends to run in families, as well as certain problems like certain illnesses, infections or even fevers, early birth can lead to increased risk of autism," said Dr. Cedrek McFadden, an Upstate-based doctor. #7NEWS #wspa #autism #tylenol #acetaminophen