Speech-language therapy is the study of disorders that affect a person's speech, language, cognition, voice, swallowing (dysphagia) and the rehabilitative or corrective treatment of physical and/or cognitive deficits/disorders resulting in difficulty with communication and/or swallowing. Speech-language therapists(SLTs) address people's speech production, vocal production, swallowing difficulties and language needs through speech therapy in a variety of different contexts including schools, hospitals, and through private practice.
Communication includes speech (articulation, intonation, rate, intensity, voice, resonance, fluency), language (phonology, morphology, syntax, semantics, pragmatics), both receptive and expressive language (including reading and writing), and non-verbal communication such as facial expression and gesture. Swallowing problems managed under speech therapy are problems in the oral and pharyngeal stages of swallowing (not oesophageal).