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Speech disorders occur when a person has difficulty producing speech sounds correctly or fluently (e.g., stuttering is a form of disfluency) or has problems with his or her voice or resonance.
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Language disorders occur when a person has trouble understanding others or sharing thoughts, ideas, and feelings. Language disorders may be spoken or written and may involve the form, content, and/or use of language in functional and socially appropriate ways.
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Social communication disorders occur when a person has trouble with the social use of verbal and nonverbal communication. These disorders may include problems communicating for social purposes or following rules for conversation and story-telling.
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Cognitive-communication disorders include problems organizing thoughts, paying attention, remembering, planning, and/or problem-solving. These disorders usually happen as a result of a stroke, traumatic brain injury, or dementia, although they can be congenital.
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Swallowing disorders are feeding and swallowing difficulties, which may follow an illness, surgery, stroke, or injury.