Understanding Diarrhea: Causes, Dehydration & Signs

By Rajeshwaari Kalla | July 24, 2025 | Images: Canva

Why It’s Important to Understand

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While diarrhea is quite common, it is important to know the cause and  assess the level of dehydration to  prevent complications

Acute vs Chronic

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Acute diarrhea refers to the abrupt onset of loose stools or increased frequency of stools. Chronic diarrhea is when loose stools last for more than 4 weeks

Bacteria and Viruses

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Diarrhea can be caused by organisms  like Staphylococcus aureus, Rotavirus, Escherichia coli and Vibrio  cholerae (cholera)

Unusual and Toxic Causes

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Other causes include consumption of certain kinds of mushrooms, heavy metals like arsenic and also due to malabsorption syndromes

When the Gut Is to Blame

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Inflammatory bowel diseases, irritable bowel syndrome, carcinoma of the colon, bacterial toxins and laxative abuse can also lead to diarrhea

Depth of Dehydration

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The severity of dehydration must be assessed. The urine output may be markedly reduced in severe  dehydration caused by diarrhea

From Irritability to Coma

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As dehydration progresses, the person may become irritable, then lethargic and ultimately comatose if there is no intervention or treatment

Dry Mouth as a Red Flag

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The mouth and oral mucosa may become dry or even parched due to excessive loss of water by diarrhea through loose stools

Blood Pressure as a Clue

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While mild dehydration may not have any effect on the blood pressure,  severe forms can cause marked  reduction in the blood pressure

Delay Treatment

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If not timely treated, complications like shock, sepsis, haemolytic-uremic syndrome and reactive arthritis due to offending organisms like Shigella

Next: 10 Things to Know Sodium Balance & Hyponatremia
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