What kinds of disorders can speech therapy treat?
Speech therapy can be used to treat language disorders, speech disorders, and swallowing and hearing problems.
Language disorders
A language disorder can affect your ability to distinguish between different speech sounds, to name objects and build complete sentences. In children, the causes of these disorders are often unclear. The main risk factors are hearing disorders, general delayed development and brain development disorders.
Language disorders in adults are almost always the result of brain injury or disease. People who have had a stroke, for example, often have trouble forming sentences or remembering words. That type of disorder is called aphasia.
Speech disorders
People with speech disorders have difficulty producing certain speech sounds, saying words clearly or talking fluently.
Children often have problems with pronunciation. That usually involves a lisp - and most often affects the pronunciation of "S" or "Z" sounds. Speech disorders may be the result of developmental disorders, but psychological factors might also play a role. Adults who have neurological illnesses can also develop speech disorders. This makes it difficult to understand them.
Another group of speech disorders, known as fluency disorders, involve problems with the flow or evenness of speech. People with this sort of disorder may stutter or “clutter,” for example. When people stutter, there are often silent pauses in their speech, or they repeat or lengthen certain sounds or syllables. Cluttering is abnormally fast speech that makes the pronunciation imprecise or leaves out sounds or parts of words. Fluency disorders typically have a genetic cause.
Voice disorders (dysphonia)
A voice disorder is a persistent change in someone’s voice. They might sound hoarse, strained, raspy or nearly silent. Often the voice is somewhat weak – in other words, it cracks easily or the person is not able to speak loudly. Voice disorders may arise from speaking too much or too loudly, from using the wrong breathing technique, or from problems with the voice box (larynx) like vocal nodules. Psychological causes like depression or a reaction to a distressing event can change a person’s voice too.
Trouble swallowing
In people with swallowing problems, the movements of the muscles involved in swallowing are affected. This leads to problems transporting food through the mouth and throat. Damage to the nervous system is often the cause – which could be caused by a stroke, Parkinson's, multiple sclerosis, dementia or infection such as Lyme disease or tetanus, for example. Other possible causes include diseases affecting the mouth or throat (like inflammations or tumors), deformities or a head injury. If food gets into the lungs because of a swallowing disorder, it can lead to life-threatening complications.
Hearing disorders
People who are affected by hearing loss (a hearing impairment) are unable to hear speech and sounds properly. A person who is unable to hear or hears hardly anything is said to be deaf. Hearing disorders can be caused by infections, sudden hearing loss or injuries. Loud sounds can also harm your hearing and lead to permanent hearing loss. Adults mostly develop hearing disorders in old age (age-related hearing loss). In children they are likely caused by improper development before birth.