Invisible disability

Invisible disabilities are disabilities that are not immediately apparent. For instance, some people with visual or auditory disabilities who do not wear glasses or hearing aids, or discreet hearing aids, may not be obviously disabled. Some people who have vision loss may wear contact lenses. A sitting disability is another category of invisible impairments; sitting problems are usually caused by chronic back pain. Those with joint problems or chronic pain may not use mobility aids on some days, or at all. Most people with RSI move in a 'normal' and inconspicuous way, and are even encouraged by the medical community to be as active as possible, including playing sports; yet those people can have dramatic limitations in how much they can type, write or how long they can hold a phone or other objects in their hands.

Invisible disabilities are chronic illnesses and conditions that significantly impair normal activities of daily living. In the United States, 96% of people with chronic medical conditions show no outward signs of their illness, and 10% experience symptoms that are considered disabling.

Invisible disabilities, also called "hidden disabilities", can hinder a person's 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. Others may not understand the cause of the problem, if they cannot see evidence of it in a visible way. Students with cognitive impairments find it difficult to organize and complete school work, but teachers who are unaware of the reason for a student's difficulties, can become impatient:

I recently met Grace, a woman who had a traumatic brain injury when she was sixteen years old. She was in a car accident, an all too common occurrence. An accident occurs, the head hits a part of the car and internal damage to the brain results, ranging from mild to severe. Grace shows no outside cues of brain damage. There are no visible cues of her head injury. Grace's walking, vision and physical reflexes look "normal." [...] People look at Grace and assume she is fine and then react to her difficulty as if she is being lazy or choosing to be obstinate. Teachers' judgments of Grace have been based on assumptions made from Grace's physical appearance.

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Wikipedia