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The parts of the mouth and neck involved in swallowing are the tongue, pharynx or throat, larynx or voice box, esophagus or food channel, and trachea or windpipe.
People with dysphagia have difficulty swallowing and may even experience pain while swallowing (odynophagia). Some people may be completely unable to swallow or may have trouble safely swallowing liquids, foods, or saliva. When that happens, eating becomes a challenge. Often, dysphagia makes it difficult to take in enough calories and fluids to nourish the body and can lead to additional serious medical problems.
Dysphagia can be serious. Someone who cannot swallow safely may not be able to eat enough of the right foods to stay healthy or maintain an ideal weight.
Food pieces that are too large for swallowing may enter the throat and block the passage of air. In addition, when foods or liquids enter the airway of someone who has dysphagia, coughing or throat clearing sometimes cannot remove it. Food or liquid that stays in the airway may enter the lungs and allow harmful bacteria to grow, resulting in a lung infection called aspiration pneumonia.
Swallowing disorders may also include the development of a pocket outside the esophagus caused by weakness in the esophageal wall. This abnormal pocket traps some food being swallowed. While lying down or sleeping, someone with this problem may draw undigested food into the throat. The esophagus may also be too narrow, causing food to stick. This food may prevent other food or even liquids from entering the stomach.
Dysphagia has many possible causes and happens most frequently in older adults. Any condition that weakens or damages the muscles and nerves used for swallowing may cause dysphagia. For example, people with diseases of the nervous system, such as cerebral palsy or Parkinson’s disease, often have problems swallowing. Additionally, stroke or head injury may weaken or affect the coordination of the swallowing muscles or limit sensation in the mouth and throat.
People born with abnormalities of the swallowing mechanism may not be able to swallow normally. Infants who are born with an opening in the roof of the mouth (cleft palate) are unable to suck properly, which complicates nursing and drinking from a regular baby bottle.
In addition, cancer of the head, neck, or esophagus may cause swallowing problems. Sometimes the treatment for these types of cancers can cause dysphagia. Injuries of the head, neck, and chest may also create swallowing problems. An infection or irritation can cause narrowing of the esophagus. Finally, for people with dementia, memory loss and cognitive decline may make it difficult to chew and swallow.
There are different treatments for various types of dysphagia. Medical doctors and speech-language pathologists who evaluate and treat swallowing disorders use a variety of tests that allow them to look at the stages of the swallowing process. One test, the Flexible Endoscopic Evaluation of Swallowing with Sensory Testing (FEESST), uses a lighted fiberoptic tube, or endoscope, to view the mouth and throat while examining how the swallowing mechanism responds to such stimuli as a puff of air, food, or liquids.
A videofluoroscopic swallow study (VFSS) is a test in which a clinician takes a videotaped X-ray of the entire swallowing process by having you consume several foods or liquids along with the mineral barium to improve visibility of the digestive tract. Such images help identify where in the swallowing process you are experiencing problems. Speech-language pathologists use this method to explore what changes can be made to offer a safe strategy when swallowing. The changes may be in food texture, size, head and neck posture, or behavioral maneuvers, such as “chin tuck,” a strategy in which you tuck your chin so that food and other substances do not enter the trachea when swallowing. If you are unable to swallow safely despite rehabilitation strategies, then medical or surgical intervention may be necessary for the short-term as you recover. In progressive conditions such as amyotrophic lateral sclerosis (ALS, or Lou Gehrig’s disease), a feeding tube in the stomach may be necessary for the long-term.
For some people, treatment may involve muscle exercises to strengthen weak facial muscles or to improve coordination. For others, treatment may involve learning to eat in a special way. For example, some people may have to eat with their head turned to one side or looking straight ahead. Preparing food in a certain way or avoiding certain foods may help in some situations. For instance, people who cannot swallow thin liquids may need to add special thickeners to their drinks. Other people may have to avoid hot or cold foods or drinks.
For some, however, consuming enough foods and liquids by mouth may no longer be possible. These individuals must use other methods to nourish their bodies. Usually this involves a feeding system, such as a feeding tube, that bypasses or supplements the part of the swallowing mechanism that is not working normally.
