Difference between dysentery and diarrhea
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diarrhea AND dysentery
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WHO diarrhoea definition dysentery blood stool
| Feature | Diarrhea | Dysentery |
|---|---|---|
| Meaning | Passage of loose or watery stools, usually 3 or more times in 24 hours | A type of diarrhea with visible blood, often with mucus |
| Main site involved | Usually small intestine | Usually colon (large intestine) |
| Stool | Large-volume, watery stools | Frequent, small-volume stools with blood and mucus |
| Pain / urgency | Crampy abdominal discomfort may occur | Often marked lower-abdominal cramps, urgency, and straining (tenesmus) |
| Fever | May be absent or mild | More likely, especially with invasive bacterial infection |
| Common causes | Viruses, food poisoning, toxin-producing bacteria, medicines, food intolerance | Invasive infections such as Shigella, Campylobacter, Salmonella, certain E. coli, or Entamoeba histolytica |
| Main danger | Dehydration and electrolyte loss | Dehydration plus possible significant intestinal inflammation or infection |
Key point: Dysentery is essentially bloody inflammatory diarrhea. WHO defines it as a diarrheal episode with visible blood in the stool, while diarrhea is broader and may simply be watery loose stools. WHO definition
Seek urgent medical care for blood in stools, high fever, severe abdominal pain, dehydration, black stools, or diarrhea in a young child, older adult, pregnant person, or immunocompromised person. Avoid using loperamide alone when there is bloody diarrhea or fever unless a clinician advises it.
What are the warning signs of dehydration?
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dehydration clinical signs
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CDC dehydration signs adults children emergency warning signs
Early or mild dehydration signs
- Thirst
- Dry mouth, lips, or tongue
- Dark yellow urine or urinating less often
- Tiredness, headache, dizziness, or lightheadedness
- Dry skin
Warning signs of significant dehydration
- Very little or no urine
- Fast heartbeat or rapid breathing
- Sunken eyes
- Skin that stays “tented” briefly after being pinched
- Weakness, unusual sleepiness, irritability, or difficulty concentrating
- Feeling faint when standing
Emergency signs: seek urgent medical care now
- Confusion, fainting, inability to stay awake, or marked drowsiness
- Cold, pale, clammy hands or feet
- Severe weakness, very rapid pulse, or rapid/deep breathing
- Inability to keep fluids down because of repeated vomiting
- No urine for many hours, especially with ongoing diarrhea or vomiting
In infants and children, look for no tears when crying, dry mouth, fewer wet diapers or no wet diaper for 3 hours or more, sunken eyes, a sunken soft spot on the head in infants, unusual sleepiness, or poor feeding. MedlinePlus guidance and CDC advice list these as concerning signs.
With diarrhea or vomiting, start frequent small sips of an oral rehydration solution if possible. Blood in stool, high fever, or dehydration signs warrant prompt medical assessment.
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