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13.41: Digestive System Diseases

Difficulty Level: At Grade Created by: CK-12
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Practice Digestive System Diseases
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What's worse than an upset stomach?

You've probably had an upset stomach. Most likely it was due to something you ate. But imagine bleeding from your stomach. That's a little different than your stomach just being upset. Stomach ulcers can be very serious.

Diseases of the Digestive System

Many diseases can affect the digestive system. Three of the most common are food allergies, ulcers, and heartburn.

  • Food allergies occur when the immune system reacts to substances in food as though they were harmful “foreign invaders.” Foods that are most likely to cause allergies are pictured in Figure below. Symptoms of food allergies often include vomiting and diarrhea.

These foods are the most common causes of food allergies.

  • Ulcers are sores in the lining of the stomach or duodenum that are usually caused by bacterial infections. Symptoms typically include abdominal pain and bleeding.

You can see how stomach ulcers develop at this link: http://www.youtube.com/watch?v=4bXZRgJ-1fk.

  • Heartburn is a painful burning sensation in the chest caused by stomach acid backing up into the esophagus. The stomach acid may eventually cause serious damage to the esophagus unless the problem is corrected.


  • Digestive system diseases include food allergies, ulcers, and heartburn.


Use this resource to answer the questions that follow.

  1. Describe the following digestive diseases:
    1. Crohn's Disease
    2. gallstones
    3. GERD
    4. hepatitis
    5. ulcers


1. Describe two diseases of the digestive system.




Disease in which the immune system makes an inflammatory response to a harmless antigen.


A painful burning sensation in the chest, caused by stomach acid backing up into the esophagus.


Sores in the lining of the stomach or duodenum; usually caused by bacterial infections.

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Difficulty Level:
At Grade
Date Created:
Feb 24, 2012
Last Modified:
May 12, 2016
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