Differential diagnoses of inflammatory bowel disease:

1. Irritable bowel syndrome (IBS)
2. Celiac disease
3. Infectious colitis (such as from bacteria, viruses, or parasites)
4. Diverticulitis
5. Microscopic colitis
6. Behçet's disease
7. Ischemic colitis
8. Radiation colitis
9. Drug-induced colitis
10. Allergic colitis

Infectious Colitis
- Bacterial colitis (e.g., Clostridioides difficile, Salmonella, Campylobacter)
- Viral colitis (e.g., rotavirus, adenovirus, norovirus)
- Parasitic colitis (e.g., Giardia lamblia, Entamoeba histolytica)

Ischemic Colitis
- Mesenteric ischemia
- Thromboembolic disease
- Hypovolemic shock

Microscopic Colitis
- Collagenous colitis
- Lymphocytic colitis

Diverticulitis
- Colonic diverticula with inflammation or infection

Drug-Induced Colitis
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Antibiotics
- Methotrexate

Radiation Colitis
- Radiation therapy to the abdomen or pelvis

Eosinophilic Colitis
- Food allergies
- Parasitic infections

Diverticular Disease
- Diverticulosis
- Diverticulitis

Appendicitis
- Inflammation of the appendix

Pelvic Inflammatory Disease (PID)
- Infection of the female reproductive organs

Endometriosis
- Implantation of uterine tissue outside the uterus

Vaginitis
- Inflammation of the vagina caused by infection, irritation, or hormonal changes