Crohn’s disease is a type of inflammatory bowel disease (IBD) that is a chronic inflammatory disease of the gastrointestinal tract.
Crohn’s disease can affect any part of the gastrointestinal (GI) tract from the mouth to the anus. It is different from ulcerative colitis, another type of IBD, that only affects the colon (large intestine).
Crohn's Disease Causes
It is not fully understood how or why some people get Crohn’s disease. It is believed that genetic and environmental factors contribute to the development of the condition.
When symptoms of Crohn’s disease worsen, it is called a flare. Triggers for flares include:
- Not taking Crohn’s disease medications as prescribed
- Use of nonsteroidal anti-inflammatory drugs (NSAIDs)
- This includes aspirin, ibuprofen (Advil, Motrin), and naproxen (Aleve)
- Use of antibiotics
- Physical and emotional stress
- Foods that irritate the gastrointestinal (GI) tract
- There is no specific food that causes flares, but every person is different and some patients may find certain foods aggravate symptoms
- Smoking, including exposure to secondhand smoke
- Gastrointestinal tract infections (such as C. difficile)
What Are Symptoms of Crohn's Disease?
Symptoms of Crohn’s disease can develop slowly and gradually and progressively worsen.
- Frequent bowel movements
- Diarrhea
- Abdominal pain and cramping
- Nausea
- Vomiting
- Loss of appetite
- Fatigue
- Fever
- Weight loss
- Gastrointestinal ulcers
- Rectal bleeding/blood in stool
- Disease around the anus
- Shortness of breath due to anemia
- Skin lesions and joint pain and swelling (most commonly seen in Crohn's granulomatous colitis)
- Inflammatory abscesses of fistulas (in severe cases)
What Is the Treatment for Crohn’s Disease?
Treatment for Crohn’s disease involves a combination of medication, diet changes, and sometimes surgery.
Medications used to treat Crohn’s disease include:
- Aminosalicylates (5-ASA)
- Azathioprine
- Corticosteroids
- Antibiotics
- Sulfasalazine
- Biologics/biosimilar therapies
- Immunomodulators
Diet changes used to treat Crohn’s disease include:
- Eating a healthy, balanced diet that includes:
- Eating four to six small meals daily
- Restricting dairy intake in patients who are lactose-intolerant
- During flares:
Surgery used to treat Crohn’s disease includes:
- Strictureplasty: to repair a narrowing (stricture)
- Bowel resection: to remove a damaged portion of the small or large intestine
- Fistula removal
- Abscess drainage
- Colectomy: removal of the colon
- Proctocolectomy: removal of the colon and rectum
From 
https://blog.mercy.com/crohns-disease-early-signs-prevention/