Diarrhea Causes

• Viral infections, which cause most cases of diarrhea, typically bring mild-to-moderate symptoms with frequent, watery bowel movements, abdominal cramps, and low-grade fevers. Diarrhea generally lasts from 3-7 days.

• Rotavirus is a common cause of diarrhea in infants.
• Norwalk virus is the most common cause of epidemics of diarrhea among adults and schoolage children.
• Adenovirus infections are common in all age groups.

• Bacterial infections cause the more serious cases of diarrhea. You typically get bacteria from contaminated foods or drinks (food poisoning). Bacterial infections also cause severe symptoms with vomiting, fever, and severe abdominal cramps or abdominal pain. Diarrhea is very frequent and may be watery.

• In more serious cases, the stool may contain mucus, pus, or bright red blood. Most of these infections are associated with local outbreaks of disease. Family members or others eating the same food may have similar illnesses. Foreign travel is a common way to contract traveler's diarrhea.
  • Campylobacter, salmonellae, and shigella organisms are the most common causes of bacterial diarrhea.
    
    
  • Less common causes are Escherichia coli (commonly called E coli) and yersinial, listerial, and cryptosporidial bacteria.