Practical guide
Persistent or chronic diarrhea
Diarrhea lasting weeks needs evaluation for infection, medication effects, intolerance, inflammatory disease, malabsorption, or other causes.
Seek prompt medical care for blood or black stool, severe pain, confusion, fainting, signs of serious dehydration, or diarrhea in a very young infant. Higher-risk people should contact a clinician sooner.
Quick answer
Diarrhea lasting weeks needs evaluation for infection, medication effects, intolerance, inflammatory disease, malabsorption, or other causes.
Key takeaways
- Preventing dehydration is the first priority.
- Most short episodes improve with fluids, rest, and a return to normal food as tolerated.
- Medicines are not right for every person or every cause.
- Persistent or severe symptoms need medical evaluation.
What to do first
Begin with fluids and electrolytes, small frequent sips, rest, and food as tolerated. Keep track of stool frequency, urine, fever, pain, blood, and the ability to drink.
What can make this different
Age, medications, recent travel, antibiotics, immune status, and other medical conditions can change both the likely cause and how quickly medical advice is needed.
Common mistakes
Do not rely on a “miracle remedy,” ignore dehydration, exceed medicine labels, or use anti-diarrheal medicines to mask severe symptoms.
Next step
If the pattern is severe, unusual, persistent, or accompanied by warning signs, contact a clinician. Bring a medication list and a simple timeline of symptoms.
Common questions
What is the first priority?
Replacing fluid and electrolytes while monitoring for dehydration.
When should I call a clinician?
Sooner for infants, older adults, pregnancy, immune suppression, recent antibiotics, blood, severe pain, high fever, or dehydration.
Should I fast?
Usually not. Eat according to appetite unless a clinician has given different instructions.
Sources
Editorial note
This page provides general education, not personalized medical advice. Content is written conservatively from public-health and clinical sources. Our planned medical-review program is described on the medical review page.