What causes nausea and rectal bleeding? 18 possible conditions

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

1

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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2

Stomach Ulcer

Stomach ulcers are painful sores in the stomach lining or small intestine. They occur when the mucus that protects the stomach from digestive juices is reduced. They are curable but can become severe if not treated.

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3

Peptic Ulcer

Peptic ulcers are sores that develop in the lining of the stomach, esophagus, or rarely in small intestine. They are usually caused by H. pylori, excessive NSAID or alcohol usage, smoking, or stomach cancer.

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4

Gastritis

Gastritis is acute or chronic inflammation of the protective lining of the stomach. It's often caused by the bacterium H. pylori, but can also be the result of excessive NSAID, alcohol, or cocaine consumption.

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5

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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6

Cirrhosis

Cirrhosis is severe scarring and poor function of the liver caused by long-term exposure to toxins such as alcohol or viral infections. Certain medications and disorder can also cause cirrhosis.

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7

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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8

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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9

Necrotizing Enterocolitis

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

Necrotizing enterocolitis is inflammation and death of intestinal tissue. It may involve just the lining or the entire thickness of the intestine. This very dangerous disease is most common in premature infants.

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10

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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11

Radiation Enteritis

Radiation is used in the treatment of cancer and comes with risks. Radiation enteritis is one of these risks. This condition is caused by the inflammation of your small intestine from radiation treatments in you...

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12

E. coli Infection

E. coli is a type of bacteria normally found in intestines. But certain kinds of E. coli can cause infection and severe symptoms like diarrhea and dehydration.

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13

Viral Gastroenteritis

Viral gastroenteritis, also known as the stomach flu, is caused by a number of different viruses. Its symptoms usually last for two to three days.

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14

Ischemic Colitis

Ischemic colitis (IC) is inflammation of the large intestine (colon). IC occurs when not enough blood flows to the colon. Abdominal pain is a common symptom. Others are diarrhea, vomiting, and belly tenderness.

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15

Medullary Cystic Disease

Medullary cystic kidney disease is a rare condition that causes cysts to form on kidneys. Kidney failure may result, symptoms of which can include changes in skin color and itchy skin.

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16

Chronic Kidney Disease

Chronic kidney disease is a progressive, irreversible destruction of the kidneys. The most common causes are high blood pressure and diabetes. Symptoms don't show until about 90 percent of the kidney has been destroyed.

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17

Hookworm Infections

Hookworms are parasites that affect the small intestine and lungs. The first sign of infection is usually a rash where the parasite entered the skin, followed by diarrhea.

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18

Malaria

Malaria is a life-threatening disease. It is typically transmitted through the bite of a mosquito infected with Anopheles. Nausea, chills, fever, and diarrhea are common symptoms.

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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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