Diarrhea is usually mild and self-limiting, but certain symptoms require prompt medical evaluation. Seek care if diarrhea lasts more than 2–3 days, or more than 24 hours in infants, older adults, or immunocompromised individuals. Immediate attention is necessary for high fever (above 38.5°C), severe abdominal pain, persistent vomiting, signs of dehydration (dry mouth, dizziness, reduced urination), or blood and mucus in stools. Chronic conditions such as inflammatory bowel disease also warrant earlier consultation. In bacterial infections, antibiotics may be prescribed; always obtain them from a certified cephalexin capsules supplier under professional guidance to ensure safety, quality, and appropriate dosing.