What causes diarrhea and gastrointestinal bleeding? 20 possible conditions

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See a list of possible causes in order from the most common to the least.

1

Crohn’s Disease

Crohn's disease is a chronic bowel disease that causes severe inflammation of the digestive tract. It is associated with abdominal pain, diarrhea, and may affect your quality of life. Crohn's disease is characterized b...

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2

Colorectal (Colon) Cancer

Colorectal cancer is a cancer that originates in the rectum or colon. Both of these organs are located at the lower portion of your digestive system. The colon is at the end of the large intestine and the rectum is a...

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3

Colonic (Colorectal) Polyps

Colonic polyps, also known as colorectal polyps, are growths that appear on the surface of your large intestine, or colon. You can have more than one polyp, and they may be flat or raised, benign or cancerous. Accordin...

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4

Ulcerative Colitis

In UC, the lining of the large intestine and the rectum become inflamed. This produces tiny sores or ulcers on the lining of the colon, often accompanied by diarrhea and cramping.

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5

Shigellosis

The number one symptom of shigellosis, a bacterial infection, is diarrhea. Its symptoms vary in intensity, so you can have this infection and not know it.

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6

Diverticulitis

Diverticulitis occurs when the bulging sacs that usually appear in the lining of the large intestine get infected or inflamed. This usually causes abdominal tenderness on the lower left side, nausea, and diarrhea.

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7

The Many Sides of Bacterial Gastroenteritis

Bacterial infections are common causes of gastrointestinal infections. This type of infection is also called "food poisoning" and is often caused by poor hygiene or ingesting foods contaminated with bacteria.

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8

Lactose Intolerance

Lactose intolerence occurs when a person's small intestine can't break down lactose, an enzyme found in dairy foods. The condition can cause many gastrointestinal symptoms.

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9

Celiac Disease (Gluten Intolerance)

Celiac disease is a digestive disorder caused by an immune reaction to gluten. Symptoms vary but can include arthritis, fatigue, and abdominal symptoms.

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10

Amebiasis

Amebiasis is a parasitic infection, common in tropical countries and caused by contaminated water. Symptoms can be severe and usually start one to four weeks after exposure.

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11

Necrotizing Enterocolitis

This condition is considered a medical emergency. Urgent care may be required.

Necrotizing enterocolitis (NEC) is inflammation and death of intestinal tissue. It may involve just the lining of the intestine or the entire thickness of the intestine. In severe cases, the intestine may even perforat...

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12

Colitis

Colitis is inflammation of the colon. Other parts of your intestines, which includes, the colon, may also be affected. If you have colitis, you will feel discomfort and pain in your abdomen. You symptoms maybe be mil...

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13

E. coli Infection

E. coli is a type of bacteria that normally live in the intestines of people and animals. However, some types of E. coli, particularly E. coli 0157:H7, can cause intestinal infection. Symptoms of intestinal infectio...

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14

Ischemic Colitis

Ischemic colitis (IC) is inflammation of the large intestine (colon). It occurs when for one reason or another, not enough blood flows to the colon. IC is most common among those over the age of 60, though it can occu...

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15

Hookworm Infections

Hookworms are parasites. This means they live off other living things. Hookworms affect your lungs and small intestine. Humans contract hookworms through roundworm eggs and larvae found in dirt contaminated by feces...

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16

Ebola Virus and Disease

This condition is considered a medical emergency. Urgent care may be required.

Ebola disease-also called Ebola hemorrhagic fever or Ebola fever-is a rare and often fatal illness that humans and nonhuman primates (such as monkeys and gorillas) can contract. There have been several outbreaks o...

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17

Anthrax

This condition is considered a medical emergency. Urgent care may be required.

Anthrax is a serious illness caused by a microbe that lives in soil, called Bacillus anthracis. It became famous in 2001 when anthrax was used as a biological weapon and sent in the United States mail. The anthra...

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18

Whipple's Disease

Whipple's disease is caused by Tropheryma whipplei bacteria. It's a relatively rare disease that affects the digestive system and can spread to the heart, lungs, brain, joints, and eyes. The condition can be lif...

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19

Carcinoid Syndrome

Carcinoid syndrome is a condition in which a carcinoid tumor secretes chemicals into your bloodstream. These tumors are rare and cancerous. They are usually located in your gastrointestinal tract or lungs. According t...

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20

Intussusception

Intussusception occurs when a portion of the intestine folds inside another part. This causes a blockage in the intestine. It is most common in young boys.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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