Crohn’s Symptoms

Crohn’s disease symptoms range from mild to severe. They may vary over time and from person to person, depending on what part of the gastrointestinal (GI) tractCollectively referring to the mouth, esophagus, stomach, small and large intestines, and anus. is inflamed. And because symptoms vary from person to person, the way to gauge what you consider a flare-up of symptoms is relative to what is “normal” for you.

Common Crohn’s disease symptoms include:

Crohn’s can affect the entire GI tract — from the mouth to the anus — and can be progressiveIncreasing in extent or severity., so over time, your symptoms could get worse. That's why it's important that you have an open and honest conversation about your symptoms, since your doctor will use that information to help determine what treatment plan is best for you.

It might be helpful to refer to the chart below to help you understand the differences between mild, moderate and severe symptoms, since your doctor may use similar measures.

Crohn’s Disease Symptom Severity

Mild to Moderate

You may have symptoms such as:

  • Frequent diarrhea
  • Abdominal pain (but can walk and eat normally)
  • No signs of:
    • Dehydration
    • High fever
    • Abdominal tenderness
    • Painful mass
    • Intestinal obstruction
    • Weight loss of more than 10%

Moderate to Severe

You may have symptoms such as:

  • Frequent diarrhea
  • Abdominal pain or tenderness
  • Fever
  • Significant weight loss
  • Significant anemia (a few of these symptoms may include fatigue, shortness of breath, dizziness and headache)

Very Severe

Persistent symptoms despite appropriate treatment for moderate to severe Crohn’s, and you may also experience:

  • High fever
  • Persistent vomiting
  • Evidence of intestinal obstruction (blockage) or abscess (localized infection or collection of pus). A few of these symptoms may include abdominal pain that doesn’t go away or gets worse, swelling of the abdomen, nausea or vomiting, diarrhea, and constipation.
  • More severe weight loss

Once you and your doctor have discussed your symptoms and created a treatment plan, it’s important to follow directions and take your treatment as prescribed. If you ever have any questions or concerns about your treatment, you should contact your doctor before making any changes or adjustments.

Crohn’s disease is unpredictable. Over time, your symptoms may change in severity, or change altogether. You may go through periods of remission—when you have few or no symptoms. Or your symptoms may come on suddenly, without warning.

Tips for patients with IBD

Gastroenterologist Dr. Millie Long discusses 3 key tips for patients with Crohn’s and ulcerative colitis.

Millie Long, M.D., M.P.H., is an Associate Professor at the University of North Carolina Chapel Hill School of Medicine.

The location of your disease may determine what kind of symptoms you have

The five types of Crohn’s disease and their symptoms:

  • Ileocolitis

    Affects the end of the small intestine (the ileum) and the large intestine (the colon). Symptoms include weight loss, diarrhea and cramping or pain in the middle or right lower abdomen.

  • Ileitis

    Affects the ileum. Symptoms include weight loss, diarrhea and cramping or pain in the middle or right lower abdomen.

  • Jejunoileitis

    Characterized by patchy areas of inflammation in the upper half of the small intestine (the jejunum). Symptoms include mild to strong abdominal pain and cramps following meals, as well as diarrhea.

  • Gastroduodenal Crohn’s disease

    Affects the stomach and the beginning of the small intestine (the duodenum). Symptoms include loss of appetite, weight loss, nausea, and vomiting.

  • Crohn’s colitis

    Affects the colon. Symptoms include diarrhea, rectal bleeding, and disease around the anus (abscess, fistulas, ulcers).

To help you be prepared for unexpected symptoms, carry a Restroom Request Card* when you’re out and about. It can help you discreetly ask for access to restricted restrooms.

Complications of Crohn’s disease

Along with painful symptoms, Crohn’s disease can lead to complications in your intestines such as:

  • Obstruction (blockage) of the intestines
  • Formation of scar tissue
  • Fissures (small cuts or tears in the anal canal, which may bleed)
  • Abscesses (localized infection or collection of pus)
  • Fistulas (abnormal tunnels that form between two structures of the body)

Your doctor may recommend surgery to remove a damaged portion of your digestive tract to close fistulas, remove scar tissue, or to repair damage caused by Crohn’s disease.

In addition to the symptoms listed above, Crohn’s disease complications may include:

Crohn’s can affect more than the GI tract

Sometimes, Crohn’s disease causes inflammation outside of the GI tract, in areas such as:




These symptoms are called extra-intestinalSituated or occurring outside the intestines. symptoms and can also be linked to inflammation. You should talk to your doctor if you experience any symptoms—even if they seem to have nothing to do with your gastrointestinal tract.

Inflammation can lead to Crohn’s disease symptoms

Painful flare-upsThe sudden intensification of disease symptoms or the return of symptoms suddenly. occur when the lining of your intestines swells and thickens, obstructing normal movement of food through your digestive tract. Learn more about your Crohn’s symptoms and how they could be linked to damaging inflammation with Expert Advice.

Understand Your Inflammation

Learn how it can play a role in your symptoms.

See Inside Inflammation

What Causes Crohn’s Disease?

It’s likely a combination of factors—and not something you ate.

Learn More

How Your Medication Works

Take a look at the different kinds of treatments and what they do.

Review Crohn’s Treatments

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