Abdominal pain and diarrhea causes
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Common Infectious Causes of Abdominal Pain and Diarrhea
Infections are among the most frequent causes of abdominal pain and diarrhea. Viral gastroenteritis, often called the "stomach flu," is a leading cause, typically resulting in watery diarrhea, abdominal cramps, nausea, and sometimes fever. Bacterial infections, especially from Escherichia coli, Salmonella, and Staphylococcus aureus, are also significant contributors, particularly in foodborne outbreaks. These pathogens are commonly identified in adults presenting with these symptoms, highlighting the importance of food safety and hygiene measures to prevent illness Babu2024Sriramulu2024.
Parasitic infections, such as Giardia, can also cause crampy abdominal pain, diarrhea, and flatulence, especially in travelers or those exposed to contaminated water .
Chronic and Functional Bowel Disorders
Chronic conditions like irritable bowel syndrome (IBS) and Crohn’s disease are well-known causes of ongoing abdominal pain and diarrhea. IBS is characterized by recurrent abdominal discomfort and altered bowel habits, while Crohn’s disease, an inflammatory bowel disease, can cause similar symptoms and may coexist with IBS in some patients. Both conditions require careful diagnosis and management, as their symptoms can overlap and be triggered or worsened by infections or stress Babu2024Haedrich2025.
Less Common and Rare Causes
Drug-Induced and Ischemic Causes
Chronic cocaine use can lead to enteritis, causing chronic abdominal pain and diarrhea due to repeated ischemic injury to the small bowel. This is a rare but important consideration, especially in individuals with a history of substance abuse .
Human Intestinal Spirochetosis
Human intestinal spirochetosis is a rare bacterial infection that can cause chronic abdominal pain and watery diarrhea. It is more common in immunocompromised individuals but can also occur in healthy people. Diagnosis is confirmed by colon biopsy, and symptoms typically resolve with antibiotic treatment such as metronidazole Agulto2022Valenzuela2020.
Small Intestinal Bacterial Overgrowth (SIBO)
Bacterial contamination of the small intestine, or SIBO, can present with chronic diarrhea and abdominal pain, particularly in children. Diagnosis can be made using breath hydrogen tests, and symptoms often improve dramatically with antibiotic therapy .
Post-Transplant and Immunosuppressed Patients
Infections remain a frequent cause of abdominal pain and diarrhea in immunosuppressed or post-transplant patients, sometimes occurring alongside or instead of graft-versus-host disease (GVHD). A broad range of infectious agents should be considered in these populations Myerson2019Laskaratos2014.
Conclusion
Abdominal pain and diarrhea have a wide range of causes, from common infections (viral, bacterial, and parasitic) and chronic bowel disorders (IBS, Crohn’s disease) to less frequent conditions like drug-induced enteritis, rare infections such as intestinal spirochetosis, and SIBO. Accurate diagnosis often requires careful clinical evaluation, targeted testing, and consideration of patient history, including recent travel, medication use, and immune status. Early identification and appropriate management are key to symptom relief and prevention of complications Babu2024Shane2017Agulto2022+7 MORE.
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An uncommon cause of chronic abdominal pain and diarrhea.
Intestinal spirochaetosis is a rare infection with common symptoms of watery diarrhoea and non-specific abdominal pain, and should be considered in patients with common gastrointestinal symptoms.
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