Diarrhea caused by an infection may result from:
- Parasites, such as Cryptosporidium parvum, Cyclospora cayetanensis, Entamoeba histolytica, Giardia lamblia, and microsporidia
- Bacteria, such as Campylobacter, Clostridium difficile, Escherichia coli, Listeria monocytogenes, Salmonella enteritidis, and Shigella
A number of conditions that occur within the intestines can cause inflammation. This inflammation can result in diarrhea. Some of these conditions include:
- Inflammatory bowel diseases (ulcerative colitis and Crohn's disease)
- Ischemic colitis
- Pseudomembranous colitis.
Medicines that can cause chronic diarrhea include:
- Antibiotics, such as clindamycin or ampicillin
- Laxatives (when they are abused for an extended period)
- High blood pressure medications
- Certain cancer drugs.
Functional Bowel Disorders
Functional bowel disorders that can cause chronic diarrhea include:
A number of benign (noncancerous) or malignant (cancerous) growths can cause chronic diarrhea. These include:
Several problems in which the intestines do not absorb certain nutrients very well can cause chronic diarrhea. These include:
- Celiac disease (also known as celiac sprue)
- Whipple's disease.