An invisible disability, also known as a hidden disability or non-visible disability (NVD), is a physical, mental, or neurological condition that is not immediately apparent from the outside but can limit or challenge a persons movements, senses, or activities. These disabilities are typically chronic illnesses and conditions that significantly impair normal activities of daily living. Examples of invisible disabilities include chronic pain, chronic fatigue, cognitive dysfunctions, brain injuries, learning differences, mental health disorders, hearing and vision impairments, and many more. Mental disabilities or illnesses, such as ADHD, dyslexia, autism, or schizophrenia, are also classified as invisible disabilities because they are usually not detected immediately by looking or talking to a person. Invisible disabilities can hinder a persons efforts to go to school, work, socialize, and more. Although the disability creates a challenge for the person who has it, the reality of the disability can be difficult for others to recognize or acknowledge. Those with invisible disabilities are protected by national and local disability laws, such as the Americans with Disabilities Act in the US. A growing number of organizations, governments, and institutions are implementing policies and regulations to accommodate persons with invisible disabilities.