Neurodevelopmental disorder, communication problems, and repetitive/stereotypic behaviour are all characteristics of autism, a severe developmental disorder. Even though the pathophysiological causes of autism are still unclear and contested in many cases, genetic and environmental factors (and their interactions) have been identified as contributing factors. While it is widely acknowledged that various factors can cause autism, environmental factors have received a great deal of attention recently. A large part of the international debate has focused on neurotoxins such as Lead, Iron, and Cadmium, with some arguing that these and other toxic metals have a role in the development of the condition. Methods: Between March and December 2020, the study is being performed in Iraq's Al-Anbar province. 75 autistic children and 20 volunteers children served as controls in the study, all of whom had confirmed DSM-V diagnoses. An atomic absorption spectrophotometer is used to test hair samples. Two heavy elements (Lead and Iron) and one trace element (Cadmium) are measured. The results are shown as significant high in Lead ,and Iron concentrations in Autistic compared with Control, and International Normal Value, more than Lead, and Iron considered as risk environment factor for ASD, While a cadmium concentration is expressed significant high in autism and slightly in control compare with International Normal Value, and considered no risk environmental factor in Iraqi populations. It could be due to the pollution of the Iraqi environment. © 2021
