Autism spectrum disorder [ASD] is a mental condition in which the brain does not develop in what is considered a normal way. Individuals with autism have difficulty interacting, communicating, and forming relationships with others. They have difficulty not only with language and complex concepts, but also with distinguishing between reality and fantasy. Additionally, people with autism often engage in repetitive activities and are usually hypersensitive or lack sensitivity. Autism spectrum disorder has many branches or types, each branch of autism has its own symptoms and causes, but all branches are extremely similar. There is no single known cause for autism that has yet been identified, so there are likely many different causes of autism rather than just one. The combination of genetic abnormalities and environmental factors is the most likely cause of autism that research has yet been able to identify. Furthermore, autism is said to be caused by a genetic abnormality as it tends to be hereditary. Other signs of a genetic link to autism include an increased presence of chromosomal abnormalities, brain deficiencies and language difficulties, which appear to be prevalent in families of autistic children. Combinations of genetic factors are also likely linked to environmental factors, such as exposure to toxins and metals. What causes ASD in an individual is not yet known. However, extensive research is underway to try to find out more. At this point it is believed to result from changes in brain development which can be caused by a number of factors such as; environmental and genetic factors. It's not certain what causes autism, but both genetic and environmental factors play a role. The causes of autism can be divided... down the middle of the paper... although some may need special support and depend on family and friends, others live a relatively normal life. Kaiden is a four and a half year old boy who was first diagnosed with global developmental delay at age 14 months. Around the age of five months his mother noticed something different about him, at the age of 1 he started to worry but the doctors said everything was fine and eventually at the age of four he was diagnosed with ASD and it was discovered that he was autistic. Kaiden has no verbal communication skills and does not point or signal. He also has epilepsy and is about 15 months old. Kaiden has difficulty making friends and getting along with other children as he tends to head, kick, bite, scream and pinch. No one knows what the future holds for Kaiden, he is just another victim of autism and this is his heartbreaking journey.