Disease Description (Causes and Symptoms)
- Causes and pathophysiology: Gastrointestinal tuberculosis is tuberculous inflammation occurring in the mucosa and walls of the gastrointestinal tract due to Mycobacterium tuberculosis. It primarily reaches the intestines by swallowing sputum from a patient with pulmonary tuberculosis, through infected blood (hematogenous spread), by direct invasion from adjacent organs, or by spread from pelvic tuberculosis (fallopian tubes). It occurs more often in areas where food remains for a long time, such as the ileocecal region (the junction of the ileum and cecum). Its pathophysiology involves granulomatous inflammation → which may lead to mucosal ulcers, mucosal thickening, adhesions, strictures, abscesses, and perforation.
- Main symptoms: Gradually progressive abdominal pain (the most common symptom), weight loss, fever (low-grade), night sweats, fatigue, loss of appetite, nausea and indigestion, abdominal bloating, diarrhea or constipation, and occasional bloody stools. When pulmonary tuberculosis or peritoneal tuberculosis is also present, cough and sputum or ascites and signs of peritoneal irritation may accompany these symptoms.
Treatment Methods
- Standard drug treatment:
- Generally, the same anti-tuberculosis regimen as for pulmonary tuberculosis is used: a combination of Isoniazid (H), Rifampin (R), Pyrazinamide (Z), and Ethambutol (E) for the initial 2 months (daily administration), followed by H + R for at least 4 months (a total of at least 6 months).
- For complicated lesions (severe cicatricial stricture, abscess, perforation, or extensive intestinal damage) or suspected drug resistance, the treatment period may be extended (usually to 9 months or longer), or the drugs may be adjusted after resistance is confirmed.
- In cases of multidrug-resistant tuberculosis (MDR-TB), long-term treatment (from several months to several years) based on second-line drugs according to WHO guidelines and referral to a specialized clinic are necessary.
- Procedures/surgery:
- Surgical treatment may be necessary if complications occur: ostomy reconstruction or resection and anastomosis due to intestinal obstruction (stricture), emergency surgery for intestinal perforation, or hemostasis or surgery for massive bleeding.
- Supportive treatment and management:
- Nutritional management (nutritional supplementation), fluid and electrolyte correction, and pain control.
- Monitoring for hepatotoxicity and drug side effects while taking anti-tuberculosis drugs (including liver function tests and vision tests).
- There are no special restrictions on activity or diet, but limiting alcohol consumption is recommended (due to the risk of hepatotoxicity).
- Precautions:
- Stopping medication or taking it irregularly during treatment greatly increases the risk of drug resistance, so the prescribed regimen must be completed exactly as directed.
- Representative side effects of anti-tuberculosis drugs: hepatotoxicity (especially with INH, RIF, and PZA), visual impairment (EMB), and drug interactions (especially because Rifampin induces the metabolism of many drugs).
- If pulmonary tuberculosis is also present, isolation and respiratory-based precautions are necessary during the infectious period (follow the healthcare provider’s instructions).
Checklist Before an Outpatient Visit (Items to Prepare and Tests/Records to Bring)
- Items to prepare/bring:
- A list of currently used medications, nutritional supplements, and herbal medicines
- Copies or summaries of previous test results (chest X-ray, abdominal CT, endoscopy/biopsy results, blood tests, etc.)
- The time of symptom onset and progression (weight changes, fever pattern, changes in bowel habits, and changes in the location or intensity of pain)
- Information on whether you received BCG vaccination or have a history of tuberculosis, and any history of tuberculosis treatment (if applicable, when, which drugs, and for how long they were taken)
- Information on whether any recent contacts (family members or coworkers) have tuberculosis
- Tests likely to be performed during the outpatient visit:
- Chest X-ray (to check for accompanying pulmonary tuberculosis), abdominal CT, gastrointestinal endoscopy and tissue biopsy (testing for tuberculous granulomas, AFB staining, culture, and PCR), isolation culture of Mycobacterium tuberculosis and drug susceptibility testing, blood tests (including liver function tests), and supplementary use of an interferon-gamma release assay (IGRA) or tuberculin skin test (TST)
Examples of General Questions to Ask the Doctor
- What are the common side effects and warning signs of this medication (or combination of medications)?
- How long will the treatment last? When should my symptoms start to improve?
- What should I do if side effects such as elevated liver enzyme levels or vision changes occur?
- What should I be careful about in daily life (work, exercise, and meals) during treatment?
- What tuberculosis tests or preventive measures are needed for family members or people living with me?
Examples of Disease-Specific Questions
- Is surgery likely to be necessary? What signs (for example, sudden severe abdominal pain, a rising fever, or persistent signs of peritoneal irritation) indicate that surgery is needed?
- Can tuberculosis treatment be started even if Mycobacterium tuberculosis was not detected by culture or gene amplification (PCR) in an endoscopic biopsy? (Ask about the diagnostic criteria used at the clinic and differential diagnoses—especially Crohn’s disease.)
Additional Summary
- Early diagnosis and regular use of anti-tuberculosis drugs are crucial for the prognosis. If complications (stricture, perforation, or bleeding) occur, surgical treatment may be necessary, so immediate medical attention is recommended if symptoms worsen.