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Consistently loose or watery stools—defined as having three or more unformed, mushy, or liquid bowel movements per day for at least four weeks—are clinically referred to as chronic diarrhea. This symptom is not a disease in itself but rather a sign of an underlying physiological disturbance that may involve the gastrointestinal tract, systemic metabolism, immune function, or neuroendocrine regulation.

Common causes include irritable bowel syndrome with diarrhea (IBS-D), which is a functional disorder characterized by abdominal discomfort, bloating, and altered stool consistency without structural or biochemical abnormalities. Other important etiologies include inflammatory bowel disease (e.g., Crohn’s disease or ulcerative colitis), celiac disease (an autoimmune reaction to gluten leading to villous atrophy and malabsorption), and microscopic colitis—particularly lymphocytic or collagenous colitis—which often presents in older adults with nocturnal diarrhea and normal colonoscopy findings.

Infectious triggers should not be overlooked, especially if symptoms began acutely and persisted: post-infectious IBS or persistent colonization with pathogens such as Clostridioides difficile, Giardia lamblia, or enterotoxigenic E. coli can cause prolonged diarrhea. Additionally, medication-related causes—including antibiotics, proton pump inhibitors, metformin, selective serotonin reuptake inhibitors (SSRIs), and magnesium-containing supplements—must be carefully reviewed.

Less common but clinically significant contributors include pancreatic exocrine insufficiency (leading to steatorrhea), small intestinal bacterial overgrowth (SIBO), endocrinopathies such as hyperthyroidism or diabetes-associated autonomic neuropathy, and malignancies like carcinoid tumors or lymphoma. A thorough evaluation typically includes a detailed history (onset, duration, associated symptoms, dietary habits, travel, medications), physical examination, and targeted testing—such as stool studies (culture, ova and parasite exam, C. difficile toxin assay, calprotectin), serologic testing (e.g., tissue transglutaminase antibodies for celiac disease), and imaging or endoscopic assessment when indicated.

If you experience persistent daily loose stools—especially with warning signs such as unintentional weight loss, nocturnal diarrhea, rectal bleeding, fever, or severe abdominal pain—it is essential to consult a gastroenterologist for timely diagnosis and appropriate management.