Crohn's disease

Disease Description (Causes and Symptoms)

• Definition: Crohn’s disease is a chronic inflammatory bowel disease that can occur throughout the digestive tract, from the mouth to the anus. Inflammation affects all layers of the intestine (transmural), and lesions show a pattern of being separated by normal tissue (“skip lesions”). It commonly occurs in the ileocecal region and the terminal ileum and colon.
• Causes (summary): There is no single known exact cause. Based on the provided information and medical knowledge, contributing factors include genetic predisposition + an abnormal immune response to intestinal microorganisms (an autoimmune tendency), possible infections (e.g., mycobacteria and viruses), and environmental factors (such as smoking).
• Pathophysiology: Inflammation affects the entire intestinal wall, not only the intestinal mucosa, resulting in ulcers, strictures, fistulas (arterial formation), and abscesses. Systemic inflammatory responses may also cause extraintestinal manifestations involving the joints, skin, eyes, liver, and other organs.
• Main symptoms: Abdominal pain (mainly in the lower abdomen), diarrhea (possibly accompanied by mucus and blood), weight loss, fever, nausea and vomiting, loss of appetite, fatigue, perianal abscesses, fistulas, and anal fistulas (according to the provided materials, anal disease is very common), arthralgia and arthritis, and complications related to nutritional deficiencies such as osteoporosis.

Treatment Methods

• Treatment goals: Relieve symptoms, suppress intestinal inflammation, prevent complications (such as strictures, fistulas, perforation, and bleeding), and maintain or improve quality of life.
• Medication treatment (standard summary):
  • 5-ASA drugs (sulfasalazine, mesalamine): Used for mild disease and maintenance therapy, but do not have the same effect on all Crohn’s disease lesions (also supported by the provided materials). Side effects include headache, gastrointestinal symptoms, and hypersensitivity reactions.
  • Corticosteroids (such as prednisolone): Effective for controlling acute inflammation, but long-term use can cause numerous side effects (such as osteoporosis, hypertension, diabetes, and increased risk of infection).
  • Immunosuppressants (such as azathioprine, 6-MP, and methotrexate): Used in steroid-dependent patients or for maintenance therapy. It may take several months for effects to appear. Side effects include bone marrow suppression, hepatotoxicity, and increased risk of infection (regular blood tests are necessary — the provided materials recommend testing every 2–3 months).
  • Antibiotics (such as metronidazole and ciprofloxacin): Used to manage infections associated with abscesses, fistulas, and strictures. With metronidazole, caution is required regarding interactions with alcohol.
  • Biologic agents:
    • Anti-TNF agents (infliximab [Remicade], adalimumab [Humira]) — Used for moderate-to-severe disease or when immunosuppressants have failed. They increase the risk of tuberculosis and opportunistic infections.
    • Other targeted therapies (such as vedolizumab and ustekinumab) — Options when previous treatments have failed.
  • Nutritional therapy: Particularly effective in children (including exclusive enteral nutrition). Nutritional supplementation and correction of deficiencies are also important in adults.
  • Supportive treatment: Iron, vitamin B12, vitamin D, and calcium supplementation, among others (to prevent anemia and osteoporosis).
• Procedures and surgery:
  • Indications: When complications occur (such as intestinal obstruction, severe strictures, perforation, bleeding that does not respond to treatment, abscesses, and fistulas). According to the provided materials, approximately 50% of patients require surgery during treatment.
  • Types of surgery: Partial resection (removal of the affected area), strictureplasty, total colectomy with ileostomy creation (in cases of severe colitis), and others. Surgery does not cure the disease, and recurrence is possible — surgery should be performed carefully when necessary.
• Prevention and management (lifestyle management):
  • Stop smoking (smoking worsens the disease and increases the rates of recurrence and postoperative recurrence).
  • Maintain a balanced nutritional intake and use nutritional supplements when necessary (protein and calorie supplementation).
  • Manage bone density (vitamin D/calcium supplementation, weight-bearing exercise, and osteoporosis prevention during long-term steroid use).
  • Prevent infections (consider vaccination — live vaccines are contraindicated during immunosuppressive treatment).
  • Monitor medication use and side effects (regular blood tests, liver function, infection markers, and others).
• Precautions before and during treatment:
  • Screening for infectious diseases such as tuberculosis and hepatitis B is necessary before starting biologic agents.
  • Monitor for hematologic abnormalities (bone marrow suppression) when using immunosuppressants.
  • Manage systemic side effects associated with long-term steroid use.
  • NSAIDs may damage the intestinal mucosa and should be used with caution.

Checklist Before an Outpatient Visit (Including Example Questions)

• Items/information to prepare:
  • A list of all currently used medications (including prescription drugs, over-the-counter drugs, and nutritional supplements), including doses and times of administration
  • History of previous surgeries and hospitalizations, and surgical records (the operative report, if possible)
  • Recent test results (colonoscopy, contrast studies, abdominal CT/MR findings, blood tests [CBC, CRP, ESR, liver function], iron studies, vitamin B12, vitamin D, and others)
  • Bring stool test results if available (culture, C. difficile, fecal calprotectin, and others)
  • A symptom diary (recent changes in symptoms, frequency and characteristics of diarrhea, location and intensity of abdominal pain, weight changes, presence of fever, and presence of blood or mucus during bowel movements)
  • Lifestyle information (smoking status, eating patterns, stress factors, and occupation)
  • Reproductive information (pregnancy plans, current pregnancy status, and contraceptive use)
• Key information to tell the healthcare provider during the outpatient visit (examples):
  • “This is my recent diarrhea frequency and weight change. I am taking my medications as follows.”
  • “I recently developed pain/discharge around the anus (suspected abscess or fistula).”
  • “These were the results of my previous tests, and I am concerned about the side effects of my current medication.”

General Example Questions to Ask the Doctor

• What are the main side effects of this medication, and what monitoring (testing intervals) is required?
• What tests should be performed first before starting a biologic agent (or immunosuppressant), such as tests for tuberculosis and hepatitis B?
• What are the treatment goals for my disease (induction of remission versus maintenance), and what is the expected treatment duration?
• If I am planning pregnancy or breastfeeding, which medications should be stopped or replaced?
• What should I pay particular attention to in daily life, including exercise, diet, and work activities?

Examples of Disease-Specific Questions

• I have pain and discharge around the anus. If an abscess or fistula is suspected, which diagnostic tests (proctoscopy, MRI, ultrasound, and others) and treatments (drainage, antibiotics, or surgery, and at what point) do you recommend?
• I was previously steroid-dependent. If I need to start a biologic agent (such as an anti-TNF agent), which infection screening tests and vaccinations should be prioritized?