Zenker's Diverticulum

Overview

Zenker's diverticulum is a pouch that bulges out from the back wall of the throat, just above the esophagus, in an area called the hypopharynx. It forms at a natural weak point where the muscles of the throat meet the upper esophagus. Over time, food and saliva can collect in the pouch instead of passing smoothly into the stomach.

This condition is uncommon and tends to occur in older adults. Although it is not cancerous, it can cause bothersome swallowing problems and, in some cases, lead to complications such as food entering the airway. Effective treatments are available, usually through a procedure that opens the muscle and reduces the pouch.

Symptoms

Symptoms often develop slowly and worsen as the pouch enlarges. They include:

• Difficulty swallowing (dysphagia), often with a sense that food is sticking in the throat.
• Regurgitation of undigested food, sometimes hours after eating.
• Bad breath from food retained in the pouch.
• A gurgling sound in the throat or neck when swallowing.
• Cough or choking, especially at night or when lying down.
• Unintended weight loss in more advanced cases.

Because retained food can spill into the airway, repeated coughing, choking, or chest infections can develop.

Causes

Zenker's diverticulum is thought to develop because of abnormal pressure and muscle coordination in the upper esophagus. When the muscle at the top of the esophagus does not relax properly during swallowing, pressure builds up against a naturally weak area of the throat wall. Over time this pressure pushes the lining outward to form a pouch.

The exact reasons this happens are not fully understood, but aging-related changes in the muscle and connective tissue are believed to play a role, which is why it is most often seen in older adults.

Risk Factors

• Older age, with most cases in people over 60
• Male sex, in which it is somewhat more common
• Problems with coordination of the upper esophageal muscle
• A history of swallowing difficulties

Diagnosis

Diagnosis usually involves imaging that shows the pouch and how it affects swallowing.

• Barium swallow study: The main test, in which you drink a contrast liquid while X-rays or video are taken to reveal the pouch and watch swallowing in motion.
• Endoscopy: A camera examination may be used carefully, since the pouch can affect how the scope is passed.
• Manometry: Occasionally used to assess pressures and muscle function in the esophagus.

A barium swallow is preferred because it clearly outlines the pouch and helps plan treatment.

Treatment

Small pouches that cause no symptoms may simply be watched. When symptoms interfere with eating or cause complications, treatment is usually a procedure to divide the muscle and reduce the pouch so food no longer collects.

• Endoscopic procedures: Performed through the mouth, these divide the muscle wall between the pouch and the esophagus and are often preferred for their quicker recovery.
• Open surgery: Through a small incision in the neck, the pouch can be removed or repositioned and the muscle cut, sometimes chosen for larger pouches.

The choice depends on the size of the pouch, the person's overall health, and local expertise. Endoscopic approaches generally offer a faster recovery and shorter hospital stay, which can be especially helpful for older adults, while open surgery may give a more complete result for very large pouches. Most people swallow more comfortably after treatment, though symptoms can occasionally return and sometimes need a repeat procedure.

Prevention

There is no known way to prevent Zenker's diverticulum, since it relates to muscle and tissue changes that are not under personal control. However, you can reduce complications and discomfort by:

• Eating slowly and chewing food well
• Drinking water during and after meals to help clear the pouch
• Avoiding eating right before lying down to reduce regurgitation and choking
• Seeking treatment when swallowing problems interfere with eating or nutrition

When to See a Doctor

See a doctor if you have ongoing trouble swallowing, regularly bring up undigested food, or notice persistent bad breath with swallowing difficulty. Seek urgent care if you experience:

• Choking or food going down the wrong way, especially with coughing or breathing trouble
• Repeated chest infections or pneumonia
• Significant unintended weight loss
• Inability to swallow food or liquids

Related Topics

Frequently Asked Questions

References

1. Mayo Clinic. Zenker's diverticulum.
2. MedlinePlus, U.S. National Library of Medicine. Swallowing problems.
3. American Gastroenterological Association. Esophageal disorders.
4. StatPearls, National Library of Medicine. Zenker Diverticulum.