Autism is a developmental and neurological disorder which occurs in during early childhood. While nobody exactly knows the reason for it, with years of research and studies we have been able to figure out the various known factors that can be the causes of autism. Out of these, the most common ones include genetics, vaccinations, ante-natal and perinatal factors, environmental factors, gut issues and some theories that suggest the role of heavy metals. However, we still cannot rule out any specific causes of autism and mostly rely on these probable factors that could have contributed to the risk of developing Autism. Understanding these factors has given some idea as to how they increase the tendency of a child to develop autism.