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| cricopharyngeal spasm ： ウィキペディア英語版 |
cricopharyngeal spasm
Cricopharyngeal spasms occur in the cricopharyngeus muscle of the pharynx. These spasms are frequently misunderstood by the patient to be cancer due to the 'lump in the throat' feeling (Globus pharyngis) that is symptomatic of this syndrome. In practice, real lumps in the throat, such as a cancer, are generally not felt until they impede ingestion of food. This is one of the reasons that a cancer can get so big before it is discovered. However, a cricopharyngeal spasm is a harmless, if uncomfortable, self-limiting disorder and will resolve itself over a period of time.
== Physiology ==
There are two sphincters in the oesophagus. They are normally contracted and they relax when one swallows so that food can pass through them going to the stomach. They then squeeze closed again to prevent regurgitation of the stomach contents. If this normal contraction becomes a spasm, these symptoms begin.〔()〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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