Characteristics of Diarrhea in Clostridioides difficile Infection

Primary Characteristics of C. difficile Diarrhea

Watery, non-bloody diarrhea is the hallmark symptom, defined as three or more unformed stools within 24 hours, often accompanied by abdominal pain and cramps, according to the World Journal of Emergency Surgery and Clinical Infectious Diseases 1, 2, 3
Diarrhea may be absent initially in some patients, particularly surgical patients with ileus, making diagnosis challenging, as noted by the World Journal of Emergency Surgery 1
Abdominal pain and cramping typically accompany the diarrhea, ranging from mild to severe, as reported by the World Journal of Emergency Surgery 1, 2
Prolonged diarrhea can lead to electrolyte imbalances and dehydration, according to the World Journal of Emergency Surgery 2

Diarrhea with mild abdominal pain and cramps can result in altered electrolyte balance and dehydration if prolonged, as noted by the World Journal of Emergency Surgery 1

Systemic features including fever, leukocytosis, and hypoalbuminemia are commonly present, as reported by the World Journal of Emergency Surgery and Clinical Infectious Diseases 1, 2, 3
Severe abdominal pain with bloody stools may occasionally be present, according to Clinical Infectious Diseases 3

In patients with inflammatory bowel disease (IBD), the clinical presentation of C. difficile may overlap with an IBD flare, as noted by the Journal of Crohn's and Colitis and Clinical Infectious Diseases 4, 5
C. difficile should be suspected in any resident of long-term care facilities exposed to systemic antimicrobial therapy in the previous 30 days who experiences at least three watery or unformed stools in 24 hours and/or abdominal pain, according to Clinical Infectious Diseases 5

Human serum albumin can bind C. difficile toxins A and B, impairing their internalization into host cells, which may explain the increased CDI severity in hypoalbuminemic patients, as reported by the World Journal of Emergency Surgery 1

Testing should only be performed on symptomatic patients with clinically significant diarrhea to avoid detecting asymptomatic colonization, as recommended by Clinical Infectious Diseases 5
A single cup specimen of diarrheal stool should be submitted for C. difficile cytotoxin assay; if the first test is negative and fever or abdominal pain and diarrhea persist despite discontinuing antibiotics, 1 or 2 additional diarrheal stool specimens should be submitted for toxin assay, according to Clinical Infectious Diseases 5

In patients with confirmed C. difficile infection, the most common symptom is watery diarrhea, defined as three or more unformed stools within a 24‑hour period【6】.
These patients frequently experience diffuse abdominal pain and cramping, most often localized to the lower abdomen where colonic inflammation occurs【6】【7】.
Fever may be present in severe cases of the infection【6】【7】.
Laboratory evaluation commonly reveals leukocytosis, indicating an elevated white‑blood‑cell count【6】【7】.
Severe disease is also associated with hypoalbuminemia, reflecting poor nutritional or inflammatory status【6】【7】.

A white‑blood‑cell count exceeding 15 × 10⁹ cells/L is a recognized predictor of severe C. difficile infection【7】.
An increase in serum creatinine to ≥133 µM/L or ≥1.5‑fold above baseline signals renal impairment and correlates with disease severity【7】.
Body temperature above 38.5 °C is another marker of severe infection【7】.
Serum albumin falling below 2.5 g/dL identifies patients at higher risk for poor outcomes【7】.

Prolonged diarrhea can lead to significant electrolyte losses (e.g., magnesium, potassium, calcium), which may cause muscle cramps or generalized leg discomfort【6】.
Dehydration from severe fluid loss can similarly precipitate muscle cramping【6】.
Comprehensive reviews and guideline statements on C. difficile infection do not list leg pain as a recognized manifestation, underscoring the need to investigate alternative etiologies when leg pain is present【6】【7】.