Diarrhea (Acute and Chronic)
What is Diarrhea (Acute and Chronic)?
Diarrhea is a condition where you have loose, watery stools three or more times in a single day. It happens when your intestines move food through too quickly or when they secrete extra fluid. This prevents your body from absorbing water and nutrients properly.
Acute diarrhea lasts less than 2 weeks and usually comes from infections or food poisoning. Chronic diarrhea continues for 4 weeks or longer and often signals an underlying condition. Both types can disrupt your daily life and lead to dehydration if not managed properly.
While occasional diarrhea is common and usually harmless, persistent episodes deserve attention. Your body loses important fluids and electrolytes that keep your systems balanced. Understanding the root cause helps you address the problem rather than just managing symptoms.
Symptoms
- Loose or watery stools occurring three or more times daily
- Urgent need to use the bathroom
- Abdominal cramping or pain
- Bloating and gas
- Nausea or vomiting
- Fever in cases caused by infection
- Blood or mucus in stool with certain infections or inflammatory conditions
- Dehydration signs including dry mouth, fatigue, and dark urine
- Unintended weight loss with chronic diarrhea
Some people with chronic conditions may experience mild symptoms that come and go. Others have severe episodes that significantly impact their quality of life.
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Causes and risk factors
Acute diarrhea typically results from viral or bacterial infections, food poisoning, or reactions to antibiotics. Travelers often experience it from contaminated water or unfamiliar bacteria. Certain medications, artificial sweeteners, and lactose intolerance can also trigger short-term episodes.
Chronic diarrhea has different root causes including inflammatory bowel disease, celiac disease, irritable bowel syndrome, or chronic infections. Small intestinal bacterial overgrowth, food sensitivities, and thyroid disorders can lead to ongoing symptoms. Stress and anxiety affect gut motility and may worsen symptoms in people with sensitive digestive systems.
How it's diagnosed
Doctors diagnose diarrhea based on your symptoms, medical history, and stool characteristics. For acute cases, testing often is not needed unless symptoms are severe or persist beyond a few days. Stool tests can identify infections, blood, or signs of inflammation.
Blood tests help assess the impact of diarrhea on your body, especially with severe or chronic cases. Chloride levels can reveal electrolyte imbalances and help guide rehydration strategies. Rite Aid offers blood testing at over 2,000 Quest Diagnostics locations to help you and your doctor understand what is happening in your body. Additional tests like colonoscopy or imaging may be needed to identify chronic conditions.
Treatment options
- Drink plenty of fluids including water, broth, and oral rehydration solutions to prevent dehydration
- Eat bland, easy-to-digest foods like bananas, rice, applesauce, and toast
- Avoid dairy products, fatty foods, high-fiber foods, and caffeine until symptoms improve
- Take probiotics to support healthy gut bacteria and reduce episode duration
- Use over-the-counter medications like loperamide for symptom relief when appropriate
- Treat underlying infections with antibiotics if prescribed by your doctor
- Manage chronic conditions with medications like anti-inflammatory drugs or immune modulators
- Identify and eliminate trigger foods through an elimination diet
- Address stress through mindfulness, therapy, or relaxation techniques
- See a doctor if diarrhea lasts more than 2 days, causes severe dehydration, or includes blood
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- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Acute diarrhea lasts less than 2 weeks and usually comes from infections or food-related issues. Chronic diarrhea continues for 4 weeks or longer and often indicates an underlying health condition. Acute cases typically resolve on their own, while chronic cases need medical evaluation to find the root cause.
See a doctor if diarrhea lasts more than 2 days in adults or 24 hours in children. Seek immediate care if you notice blood in stool, signs of severe dehydration, high fever above 102 degrees, or severe abdominal pain. Unintended weight loss or nighttime diarrhea episodes also warrant medical attention.
Blood tests help assess how diarrhea affects your body rather than identifying the exact cause. Chloride testing reveals electrolyte imbalances that occur during severe episodes and guides treatment. Blood tests can also check for inflammatory markers, thyroid problems, or celiac disease that might cause chronic symptoms.
Severe diarrhea causes your intestines to lose bicarbonate, and your body retains extra chloride to maintain balance. This creates high chloride levels and metabolic acidosis. With extreme fluid loss, total chloride depletion can occur, leading to low chloride levels instead.
Stick to bland, low-fiber foods like white rice, plain toast, bananas, and applesauce. Clear broths and crackers are also gentle on your system. Avoid dairy products, fatty or fried foods, raw vegetables, and caffeine until your symptoms improve.
Drink small amounts of fluid frequently throughout the day rather than large amounts at once. Oral rehydration solutions contain the right balance of salts and sugars to replace what you lose. Plain water is helpful, but adding electrolyte drinks or broths provides better replenishment.
Chronic diarrhea lasting 4 weeks or more often indicates an underlying condition that needs attention. Possible causes include inflammatory bowel disease, celiac disease, food intolerances, or thyroid disorders. A thorough evaluation helps identify the root cause so you can address it properly.
Yes, stress and anxiety directly affect gut function through the gut-brain connection. Your nervous system can speed up intestinal contractions and increase fluid secretion during stressful periods. People with irritable bowel syndrome are especially sensitive to stress-related diarrhea episodes.
Probiotics introduce beneficial bacteria that restore balance in your gut. They can shorten the duration of infectious diarrhea and reduce symptoms in some chronic conditions. Strains like Saccharomyces boulardii and Lactobacillus rhamnosus have the strongest evidence for diarrhea prevention and treatment.
Avoid anti-diarrheal medications like loperamide if you have bloody diarrhea, high fever, or suspected bacterial infection. These medications slow gut movement, which can trap harmful bacteria and worsen the infection. Always check with your doctor before using them if you are unsure about the cause.