Clear Diarrhea: What It Means & When It’s Serious

Key takeaways:

• Many factors can cause clear diarrhea, but most are not considered medical emergencies.
• Small changes like increasing hydration and modifying your diet can go a long way in managing clear diarrhea.
• Consult a medical professional if your diarrhea comes with a high fever, severe abdominal pain, or blood in your stool.

The gastrointestinal system is highly sensitive to various factors, including what we eat and drink, stress levels, and infection. If you experience clear diarrhea, it may be your body’s way of alerting you to something that needs addressing, whether it’s a simple dietary change or treatment for an ongoing health concern.

Occasional diarrhea that goes away on its own after a few days can be normal. However, persistent diarrhea or symptoms that worsen with time may point to something more serious. If you experience clear diarrhea alongside severe pain and cramping, a high fever, or bloody stool, it may be time to speak to a healthcare professional.

Is clear diarrhea normal?

Clear diarrhea, characterized by a watery consistency and a transparent appearance, is not uncommon.

Experiencing diarrhea of any kind may not be considered “normal,” but that doesn’t mean it’s necessarily cause for concern. While clear diarrhea may be linked to something both predictable and preventable – like dietary concerns – it can also indicate underlying health issues. While occasional, mild diarrhea may not be a major concern, symptoms that don’t resolve on their own within a few days may require medical intervention.

Common causes of clear diarrhea

Clear diarrhea can have many different causes, ranging from infections to chronic diseases. Knowing the various causes and associated symptoms can be helpful when trying to narrow down the specific cause of your symptoms.

Infection

Gastroenteritis, also known as stomach flu or stomach bug, is an inflammation of the stomach and intestines. The stomach flu is infamous for causing nausea, vomiting, and diarrhea.

Many pathogens, including viruses, bacteria, and parasites, can cause gastroenteritis. It may also be the result of food poisoning. Depending on the cause of infection, diarrhea can be clear and watery, particularly in cases with a high frequency of bowel movements.

Irritable bowel syndrome

Irritable bowel syndrome (IBS) refers to chronic abnormal bowel habits ranging from constipation to diarrhea to a combination of the two.

Patients who have IBS-D, or diarrhea-predominant IBS, are likely to experience loose, watery stools. These symptoms may also be associated with a sense of urgency to have a bowel movement.

Inflammatory bowel disease

Inflammatory bowel disease refers to chronic inflammation of the gastrointestinal tract. It branches off into two different specific conditions known as ulcerative colitis and Crohn’s disease. Diarrhea is a common symptom of both diseases.

However, you are more likely to experience watery diarrhea (with or without mucus) in ulcerative colitis than in Crohn's disease. Typically, inflammatory bowel disease requires the intervention of a healthcare provider but is not considered a medical emergency.

Food intolerance

Food intolerance refers to an adverse reaction to a certain ingredient or type of food, but it’s not quite the same thing as a food allergy. Common symptoms of food intolerance are abdominal pain, bloating, and watery diarrhea. Lactose, fructose, gluten, and artificial sweeteners such as xylitol, sorbitol, and mannitol are the most common causes of food intolerance.

Read our guide on diarrhea causes for more.

What clear diarrhea may mean based on appearance, consistency, or another symptom or condition

Clear diarrhea can be a sign of many different health conditions, which means identifying other co-occurring symptoms can be an important part of identifying the root cause. Additional details about appearance, consistency, or other symptoms can help your healthcare provider narrow in on a possible diagnosis.

• Clear diarrhea with mucus: The presence of mucus may indicate inflammation in the intestines, often associated with infections or inflammatory bowel diseases such as ulcerative colitis.
• Clear, watery, or liquidy diarrhea: This type of diarrhea is often seen in cases of viral gastroenteritis or food poisoning.
• Clear and yellow diarrhea: Yellow diarrhea may indicate a malabsorption issue, particularly related to the malabsorption of fat or carbohydrates. Liver disease, Crohn’s disease, and chronic pancreatitis are a few examples of conditions that cause malabsorption.
• Clear, foamy diarrhea: Stool that contains a lot of mucus or fat might take on a clear, foamy appearance. This symptom is most commonly associated with malabsorption issues or inflammatory bowel disease.
• Clear diarrhea accompanied by vomiting: When diarrhea is accompanied by vomiting, infections such as gastroenteritis or food poisoning are the most likely causes.
• Clear diarrhea with blood: Blood in diarrhea can be due to minor issues such as hemorrhoids or anal fissures. In other cases, it may be due to more serious issues such as bleeding from within the gastrointestinal tract, inflammatory bowel disease, or colon cancer.
• Clear diarrhea: Clear diarrhea can indicate a food intolerance, IBS, IBD, or infection.
• Clear diarrhea that occurs during a pregnancy: Clear diarrhea that occurs during pregnancy can be caused by any of the aforementioned reasons but should be evaluated promptly to avoid dehydration.

Read our guide on types of diarrhea and stool color meanings for more.

When to see a doctor about clear diarrhea

Some cases of diarrhea can be easily managed at home and will resolve on their own. It is important to know when home remedies are no longer recommended and when you should speak with a healthcare provider.

You should see a doctor if:

• Diarrhea persists for more than 24-48 hours.
• You experience abdominal pain or cramping.
• You notice signs of mild dehydration, such as reduced urination or excessive thirst.
• You notice that diarrhea is associated with certain dietary habits.

You should go to the emergency room if:

• ​​You notice blood in your stool.
• You experience symptoms of severe dehydration, such as dizziness, confusion, or palpitations.
• Your diarrhea is accompanied by a high fever or severe abdominal pain.
• You are pregnant and experience persistent watery or clear diarrhea.

Questions to ask your doctor about clear diarrhea

• What could be causing my clear diarrhea?
• Am I considered contagious? And if so, for how long?
• Are there any tests available to determine the cause of my symptoms?
• What dietary changes should I make to help manage my symptoms?

How to stop or treat clear diarrhea

Before jumping to see a healthcare professional, there are a few things that you can try on your own in the hopes of managing clear diarrhea at home.

Hydration

Diarrhea can lead to a rapid loss of fluids and electrolytes and, ultimately, dehydration. Staying hydrated and drinking plenty of water and electrolyte-containing drinks is the most important first step when you experience diarrhea.

Dietary changes

If your clear diarrhea seems to be directly linked to a particular food, such as gluten, lactose, or artificial sweeteners, you likely have a food intolerance. Avoiding these triggers will be an immediate fix to the issue. In cases where the diarrhea does not seem linked to any specific foods, the BRAT (bananas, rice, apples, toast) diet is recommended to help produce more formed and solid stools.

Over-the-counter medications

You may consider taking over-the-counter antidiarrheal medications if you are experiencing diarrhea. These medications are not intended to be taken long-term. So, if you find that you need them for more than 1-2 days, you should consult your healthcare provider to discuss the next steps.

How to prevent clear diarrhea

Some causes of clear diarrhea may be preventable, while other causes cannot be controlled. Below are a few suggestions on how to stay ahead of clear diarrhea.

Good hygiene

Infection, whether caused by a virus, bacteria, or parasite, is one of the main causes of clear diarrhea. Maintaining good hygiene and practicing frequent handwashing can help prevent the spread of infection from one person to the next.

Diet

If you have been diagnosed with a food intolerance or have noticed a pattern of diarrhea after eating certain foods, you should avoid these known triggers. Gluten, lactose, and artificial sweeteners are some of the most common foods that cause diarrhea, so they may be good places to start.

Food safety

In addition to avoiding dietary triggers, practicing food safety is also important. Always make sure that your meat, poultry, and fish are cooked thoroughly. Avoid eating anything that contains raw eggs. Only consume water that is clean and filtered, and only eat at restaurants that you trust and have passed food and safety inspections.

Frequently asked questions: clear diarrhea

You may still have some questions regarding clear diarrhea. Here are the answers to some of the most commonly asked questions about this symptom.

What if your clear diarrhea comes on suddenly?

Many causes of clear diarrhea, such as infection, irritable bowel syndrome, and inflammatory bowel disease, also contribute to a sense of urgency. The sudden onset of diarrhea does not mean you need to change anything about how to approach and treat this symptom. Sudden or not, focus on hydration, rest, and eating bland foods until your system calms down. If your symptoms don’t resolve on their own within a few days, reach out to your healthcare provider for next steps.

What if you’re experiencing clear diarrhea multiple times a day?

Multiple episodes a day of clear diarrhea warrant medical evaluation. Regardless of its cause, diarrhea can lead to a rapid loss of fluid and electrolytes, causing dehydration.

Final thoughts on clear diarrhea

In summary, clear diarrhea can be a symptom of various conditions, ranging from fairly benign dietary causes to more serious chronic health issues. Recognizing the context of your symptoms can help you determine the appropriate course of action. You should always keep in mind that while occasional and short-lived clear diarrhea may not be a cause for alarm, persistent or severe symptoms should always prompt a conversation with your healthcare provider.

General Medicine follows a strict editorial process, including using real experts to write our articles, vetted primary sources, fact-checking, a secondary medical review, and updates as necessary. This article was medically reviewed and fact checked by Dr. Lane Thaut, DO.

Sources

MedlinePlus. “Gastroenteritis.” National Library of Medicine, 16 Apr. 2018, http://medlineplus.gov/gastroenteritis.html. Accessed 23 Oct. 2024.

MedlinePlus. “Irritable Bowel Syndrome.” National Library of Medicine, 15 Apr. 2018, https://medlineplus.gov/irritablebowelsyndrome.html. Accessed 29 Oct. 2024.

McDowell, Christopher, et al. “Inflammatory Bowel Disease.” StatPearls, StatPearls Publishing, 4 August 2023, https://pubmed.ncbi.nlm.nih.gov/29262182/. Accessed 23 Oct. 2024.

Kanikowska, Alina et al. “Management of Adult Patients with Gastrointestinal Symptoms from Food Hypersensitivity-Narrative Review.” Journal of Clinical Medicine, vol. 11, no. 24, pp. 7326, 9 Dec. 2022, https://pmc.ncbi.nlm.nih.gov/articles/PMC9784954/. Accessed 23 Oct. 2024.

Semrad, Carol E.. “Approach to the Patient with Diarrhea and Malabsorption.” Goldman's Cecil Medicine, pp. 895–913, 2012, https://pmc.ncbi.nlm.nih.gov/articles/PMC7152045/. Accessed 23 Oct. 2024.