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Risk Factors for Autism
- Identical twins
Age of Parents
- Tuberous sclerosis—A rare, multi-system genetic disease. It causes benign tumors to grow in the brain and on other vital organs. The organs include the kidneys, heart, eyes, and skin. It commonly affects the central nervous system. This results in a combination of symptoms. These include seizures, developmental delay, behavioral problems, skin abnormalities, and kidney disease .
- Fragile X syndrome —A hereditary disorder of the X chromosome. It is the most common cause of inherited intellectual disability.
- Neurofibromatosis —A genetic disorder of the nervous system. It causes tumors to grow on the nerves in any part of the body. Neurofibromatosis can also produce other abnormalities. These include changes in the skin and deformed bones.
- Phenylketonuria (PKU)—A genetic disorder of the enzyme that breaks down phenylalanine. Phenylalanine is an amino acid found in certain foods. Without a proper diet, PKU can lead to intellectual disability .
- Problems during pregnancy or delivery, including rubella —Rubella is a mild, highly contagious illness that is caused by a virus. The symptoms are a rash, swollen glands, and joint pain. If a pregnant woman has rubella, it can cause birth defects in her baby. Other possible risk factors include breech delivery and birth at less than 35 weeks gestation.
- Epilepsy —This term refers to any disorder characterized by recurrent seizures. A seizure can have many symptoms. There may loss of consciousness, staring into space, abnormal jerking of the muscles, or abnormal sensations or emotions.
- Tourette’s syndrome
- Newborn encephalopathy—This is a syndrome of disturbed brain function. It results in breathing difficulties, problems with reflexes, seizures, and other symptoms.
- Moebius syndrome, cytomegalovirus , herpes encephalitis—These are sometimes listed as associated conditions.
- Birth defects—Birth defects may also make a child more likely to develop autism.
- Fetal alcohol syndrome—Caused when a mother drinks alcohol during pregnancy. It can cause birth and developmental defects in the child.
- Angelman syndrome—A genetic disorder that affects the nervous syndrome and causes delayed development, intellectual disability, speech problems, and problems with movement and balance.
- Rett syndrome—A problem with the development of the nervous syndrome. It is most common in girls.
- Smith-Lemli-Opitz—A metabolic disorder caused by a gene mutation. People with the disorder cannot make enough cholesterol.
- West syndrome—Causes a specific type of seizure seen in an epilepsy syndrome of infancy and childhood.
- Reviewer: Adrian Preda, MD
- Review Date: 03/2017
- Update Date: 03/15/2015