Autism is a spectrum disorder, which means that symptoms vary from person to person.
Some of the common signs of autism are:
-Difficulty with social interactions
-Lack of eye contact
-Restricted or repetitive behaviors
-Trouble with verbal and nonverbal communication
-Sensory sensitivities

The cause of autism is not fully understood. However, many researchers believe that it can be the result of a complex interaction between genetic and environmental factors.
Autism is caused by the interaction of genes and environmental factors. It’s not entirely clear what causes autism, but some things seem to increase the risk: having a family member with autism, being born early or late in pregnancy, complications during birth, and exposure to certain substances while in-utero.