Crohn's Disease: Symptoms, Diagnosis, and Modern Treatment Methods

What is Crohn's Disease?

Crohn's disease is a chronic inflammatory bowel disease (IBD) that can affect any part of the digestive tract, from the mouth to the anus, although it most commonly affects the small and large intestines. This condition is characterized by transmural inflammation, meaning the inflammatory process penetrates through all layers of the intestinal wall. Unlike ulcerative colitis, another common IBD, the inflammation in Crohn's disease is often segmental in nature, alternating with areas of healthy tissue. The exact cause of Crohn's disease is still unknown, but it is believed to result from a complex interaction of genetic predisposition, immune system disorders, and environmental factors.

Symptoms of Crohn's Disease: From Intestines to Skin

Symptoms of Crohn's disease can vary significantly depending on the location and severity of the inflammation. The most common manifestations include:

• Abdominal pain: Often localized in the lower right part of the abdomen, it can be cramping and worsen after eating.
• Diarrhea: Chronic diarrhea, sometimes mixed with blood or mucus.
• Weight loss and anorexia: Due to impaired nutrient absorption and decreased appetite.
• Fatigue: A constant feeling of tiredness, often associated with anemia and chronic inflammation.
• Fever: Low-grade fever, especially during flare-ups.

In addition to intestinal manifestations, Crohn's disease is often accompanied by so-called extraintestinal symptoms that can affect various organs and systems:

• Joints: Arthritis, joint pain.
• Skin: Various skin lesions can develop, such as erythema nodosum, pyoderma gangrenosum, and Sweet's syndrome. These conditions belong to neutrophilic dermatoses, characterized by inflammation without infection. The efficacy of Janus kinase inhibitors (JAK inhibitors) is being studied in the treatment of such inflammatory conditions, including pyoderma gangrenosum and Sweet's syndrome [3].
• Eyes: Uveitis, episcleritis.
• Liver and bile ducts: Primary sclerosing cholangitis (though more commonly associated with ulcerative colitis).
• Anemia: Iron deficiency and chronic inflammation often lead to anemia, which manifests as pallor, weakness, and shortness of breath. Managing anemia, including diagnosis, iron supplementation, and erythropoiesis-stimulating agents, is an important part of comprehensive treatment, although recommendations may vary depending on the underlying cause, such as in chronic kidney disease [8].

Diagnosis and a Comprehensive Approach

Diagnosing Crohn's disease requires a comprehensive approach and the exclusion of other diseases with similar symptoms. It includes:

• Clinical examination and medical history: Evaluation of symptoms and the patient's medical history.
• Laboratory tests: Complete blood count and blood chemistry (to detect inflammation, anemia, nutrient deficiencies), stool analysis (to rule out infections and assess inflammation).
• Endoscopic examinations: Colonoscopy with biopsy is the gold standard for visualizing the intestinal mucosa, identifying characteristic changes (e.g., ulcers, strictures), and obtaining tissue samples for histological examination.
• Imaging studies: CT enterography, MRI enterography, or capsule endoscopy may be used to assess the small intestine, which is inaccessible during a standard colonoscopy.

Early and accurate diagnosis is critically important for timely initiation of treatment and prevention of complications.

Modern Treatment Methods for Crohn's Disease

The goal of treating Crohn's disease is to achieve remission (reduction or disappearance of symptoms), maintain it, improve the patient's quality of life, and prevent complications. Treatment is always individualized and may include drug therapy, dietary therapy, and, in some cases, surgery.

Pharmacological Therapy

The mainstay of treatment consists of anti-inflammatory and immunosuppressive medications:

• Aminosalicylates (5-ASAs): Used for mild forms of the disease.
• Corticosteroids: Effective for managing flare-ups, but due to side effects, they are not suitable for long-term use.
• Immunomodulators: Azathioprine, mercaptopurine, methotrexate help maintain remission.
• Biological therapy: TNF-alpha inhibitors (infliximab, adalimubab), integrin antagonists (vedolizumab), and interleukin inhibitors (ustekinumab) are highly effective drugs for moderate to severe forms of Crohn's disease.
• Janus Kinase Inhibitors (JAK inhibitors): This class of drugs represents a relatively new direction in the treatment of inflammatory diseases. As noted, JAK inhibitors are being studied for the treatment of neutrophilic dermatoses such as pyoderma gangrenosum and Sweet's syndrome [3], which can be extraintestinal manifestations of Crohn's disease. Some JAK inhibitors are already approved for the treatment of IBD, demonstrating efficacy in modulating the immune response.

Supportive Therapy and Diet

In addition to core medications, supportive measures play an important role:

• Probiotics: Can help normalize the intestinal microflora and alleviate certain gastrointestinal symptoms. Research shows that probiotics can reduce dyspepsia, reflux, and diarrhea associated with microbiota disturbances, for example, during Helicobacter pylori eradication therapy [5] or constipation in Parkinson's disease patients [7]. Their role in managing symptoms and maintaining gut health in Crohn's disease is actively being studied.
• Diet: There is no specific "Crohn's disease diet," but individualized nutritional guidance from a dietitian can help reduce symptoms and prevent nutrient deficiencies. During flare-ups, enteral or parenteral nutrition may be required.
• Vitamins and minerals: Supplements of iron, vitamin B12, vitamin D, and calcium are often necessary to correct deficiencies caused by malabsorption and chronic inflammation.

Surgical Treatment

Surgery may be required to treat complications such as strictures, fistulas, abscesses, or intestinal perforation. However, surgery does not cure Crohn's disease, and inflammation can recur in other parts of the intestine.

Living with Crohn's Disease: Management and Prognosis

Crohn's disease is a chronic condition that requires lifelong management. Regular monitoring by a gastroenterologist, strict adherence to the treatment plan, and timely adjustment of therapy allow most patients to achieve long-term remission and lead full lives. It is important to pay attention to psycho-emotional well-being, as chronic illnesses can affect mental health. Support from family, friends, and support groups plays a significant role.

References

• [1] Incidence and risk factors for ketogenic diet-associated nephrolithiasis in children with pharmacoresistant epilepsy: Tertiary center experience. (Epilepsy research, 2026) https://pubmed.ncbi.nlm.nih.gov/42468066/
• [2] Oxaliplatin-induced rhabdomyolysis in a postoperative rectal cancer patient: Case report and literature review. (Frontiers in pharmacology, 2026) https://pubmed.ncbi.nlm.nih.gov/42712673/
• [3] JAK inhibitors for the treatment of pyoderma gangrenosum and Sweet's syndrome: A systematic review of published case reports. (Dermatology research and practice, 2026) https://pubmed.ncbi.nlm.nih.gov/42472066/
• [4] Intrajejunal versus oral levodopa-carbidopa therapy in Parkinson's disease: A retrospective cohort study. (Medicine, 2020) https://pubmed.ncbi.nlm.nih.gov/33181715/
• [5] Traditional Chinese medicine relieves gastrointestinal symptoms during bismuth quadruple therapy for Helicobacter pylori infection: An add-on perspective. (World journal of gastroenterology, 2026) https://pubmed.ncbi.nlm.nih.gov/41810439/
• [6] Clinical impact of an EHR-integrated hyperkalemia management system: A real-world study of 10,934 episodes. (Renal failure, 2026) https://pubmed.ncbi.nlm.nih.gov/42231677/
• [7] Clinical therapeutic effects of probiotics in patients with constipation associated with Parkinson's disease: A protocol for systematic review and meta-analysis. (Medicine, 2021) https://pubmed.ncbi.nlm.nih.gov/34871259/
• [8] Executive summary of the 2026 KDIGO Clinical Practice Guideline for the Management of Anemia in Chronic Kidney Disease (CKD). (Kidney international, 2026) https://pubmed.ncbi.nlm.nih.gov/41485807/

Disclaimer: The information provided in this article is for reference purposes only and cannot replace professional advice, diagnosis, or treatment provided by a qualified medical specialist. Always consult your doctor with any questions regarding your health or medical condition.