Autism spectrum disorder (ASD) is a complex developmental condition that involves persistent challenges in social interaction, speech and nonverbal communication, and restricted/repetitive behaviors. The effects of ASD and the severity of symptoms are different in each person.
ASD is usually first diagnosed in childhood with many of the most-obvious signs presenting around 2-3 years old, but some children with autism develop normally until toddlerhood when they stop acquiring or lose previously gained skills. According to the CDC, one in 59 children is estimated to have autism. Autism spectrum disorder is also three to four times more common in boys than in girls, and many girls with ASD exhibit less obvious signs compared to boys. Autism is a lifelong condition. However, many children diagnosed with ASD go on to live independent, productive, and fulfilling lives. The information here focuses primarily on children and adolescents.
Autism differs from person to person in severity and combinations of symptoms. There is a great range of abilities and characteristics of children with autism spectrum disorder — no two children appear or behave the same way. Symptoms can range from mild to severe and often change over time.
Characteristics of autism spectrum disorder fall into two categories.
hand-flapping and toe-walking, playing with toys in an uncommon way (such as lining up cars or flipping objects), speaking in a unique way (such as using odd patterns or pitches in speaking or “scripting” from favorite shows), having significant need for a predictable routine or structure, exhibiting intense interests in activities that are uncommon for a similarly aged child, experiencing the sensory aspects of the world in an unusual or extreme way (such as indifference to pain/temperature, excessive smelling/touching of objects, fascination with lights and movement, being overwhelmed with loud noises, etc), and others.
Also, while many people with autism have normal intelligence, many others have mild or significant intellectual delays. Additionally, people with ASD are at greater risk for some medical conditions such as sleep problems, seizures and mental illnesses.