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Is Diarrhea A Form Of Constipation? What’s The Major Difference?

By David Mercer

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This article was created after thorough research and has been improved with the assistance of AI technology. Furthermore, our dedicated editorial team has meticulously fact-checked and polished its content for accuracy and clarity.

Diarrhea and constipation are two common digestive issues that affect millions of people worldwide. While they may seem like opposite conditions, they are often interconnected in ways that many individuals may not realize.

This article aims to explore the relationship between diarrhea and constipation, addressing the question of whether diarrhea can be considered a form of constipation.

Key takeaways:

While Diarrhea and Constipation are both related to the digestive system, they are distinct conditions with different symptoms and causes.
Diarrhea is characterized by loose, watery stools and often occurs when the digestive system is moving stool through the intestines too quickly. Constipation involves difficulty passing stools, resulting in hard and dry stools.
In instances of severe constipation, diarrhea can occasionally emerge as a symptom or result, especially with fecal impaction.


Diarrhea can be caused by various factors, including viral or bacterial infections, food intolerances, medications, or underlying medical conditions like inflammatory bowel disease (IBD) or irritable bowel syndrome (IBS).


It is identified by the consistent presence of loose, watery fecal matter. If diarrhea is not treated right away, it can result in dehydration, electrolyte imbalances, and nutritional deficits. Symptoms may include abdominal cramps, bloating, nausea, and a sense of urgency to use the restroom.


On the other hand, constipation is defined as infrequent, difficult, or incomplete bowel movements. It can result from a low-fiber diet, lack of physical activity, certain medications, or underlying conditions like hypothyroidism or chronic idiopathic constipation.

Constipation can cause abdominal discomfort, bloating, and, in severe cases, fecal impaction or bowel obstruction. Symptoms may include straining during bowel movements, hard or lumpy stools, a feeling of incomplete evacuation, and abdominal pain or discomfort.

Constipation And Diarrhea: What’s The Connection?

At first glance, diarrhea and constipation may seem like entirely different conditions. However, they can be interconnected in several ways:

➡️Fecal impaction: In cases of severe constipation, a large, hard mass of stool can accumulate in the rectum or colon, leading to fecal impaction. This impaction can cause a backup of liquid stool, resulting in diarrhea or leakage of watery stool around the impacted mass. The body’s attempt to clear the blockage can lead to sudden, watery bowel movements, creating a paradoxical situation where constipation and diarrhea coexist.

➡️Irritable bowel syndrome (IBS): IBS is a functional gastrointestinal disorder that can cause alternating episodes of diarrhea and constipation. Individuals with IBS may experience periods of diarrhea followed by periods of constipation, or vice versa, due to the disorder’s impact on intestinal motility and sensitivity. The exact cause of IBS is unknown, but it is believed to involve a combination of factors, including gut dysbiosis, inflammation, and altered gut-brain communication.

➡️Dietary changes: Sudden changes in diet, such as an increase in fiber intake or the consumption of certain foods, can trigger either diarrhea or constipation, depending on the individual’s digestive system and sensitivity. For example, a sudden increase in fiber may initially cause diarrhea as the body adjusts, while a low-fiber diet can lead to constipation.

➡️Medications: Certain medications, like antibiotics, can disrupt the gut microbiome, leading to diarrhea. Conversely, some medications, such as opioid painkillers or antidepressants, can cause constipation by slowing down the digestive process and reducing intestinal motility.

➡️Underlying conditions: Certain medical conditions, like inflammatory bowel diseases (IBD) or diabetes, can cause alternating episodes of diarrhea and constipation due to their impact on the digestive system. IBD, for instance, can lead to inflammation and damage to the intestinal lining, resulting in diarrhea during flare-ups and constipation during periods of remission.

Is Diarrhea A Form Of Constipation? 

While diarrhea and constipation are distinct conditions, they can be related in some cases. Diarrhea can sometimes be a symptom or consequence of severe constipation, particularly when fecal impaction occurs. In these instances, the backed-up liquid stool can leak around the impacted mass, leading to diarrhea-like symptoms.

However, it is essential to note that diarrhea and constipation are not always directly related. Diarrhea can occur independently due to various factors, such as infections, food intolerances, or medications, without any underlying constipation. Conversely, constipation can also exist without leading to diarrhea, especially in cases where the cause is related to lifestyle factors or underlying medical conditions.

The relationship between diarrhea and constipation is complex and can vary depending on the individual’s circumstances. While they may seem like opposites, they can sometimes coexist or alternate in certain situations, such as IBS or fecal impaction.

Also read: Can High Cholesterol Cause Headaches? Facts Revealed!

When To Contact A Doctor?

In the following circumstances, you must get medical attention.

🚫Persistent diarrhea: If diarrhea lasts for more than a few days or is accompanied by severe abdominal pain, fever, or blood in the stool, it may indicate a more serious underlying condition that requires medical attention.

🚫Severe constipation: If constipation persists for more than a week or is accompanied by severe abdominal pain, vomiting, or an inability to pass gas or stool, it may require medical intervention to prevent complications like fecal impaction or bowel obstruction.

🚫Dehydration: Both diarrhea and constipation can lead to dehydration, which can be dangerous, especially for children, older adults, and individuals with underlying medical conditions. Severe thirst, parched lips, lightheadedness, and black urine are indicators of dehydration.

🚫Unexplained weight loss: If diarrhea or constipation is accompanied by unexplained weight loss, it may be a symptom of an underlying medical condition that requires evaluation by a healthcare professional.

Seeking prompt medical attention can help identify the root cause of digestive issues and ensure appropriate treatment to alleviate symptoms and prevent potential complications.

Summing Up

Although diarrhea and constipation present as separate issues, they may have connections under specific circumstances. In cases of severe constipation with fecal impaction, diarrhea-like symptoms may occur due to the leakage of liquid stool around the impacted mass. Additionally, conditions like IBS, dietary changes, medications, and underlying medical conditions can contribute to the alternating patterns of diarrhea and constipation.

However, it is important to note that diarrhea and constipation are not always directly related, and diarrhea can occur independently due to various factors. If you experience persistent or severe symptoms of diarrhea or constipation, it is essential to seek medical attention to identify and address the underlying cause and prevent potential complications.

By understanding the complex relationship between diarrhea and constipation, individuals can better recognize when these digestive issues may be interconnected and take appropriate steps to manage their symptoms and promote overall digestive health.


1. Why do I have a normal stool and then diarrhea?

This can happen due to various reasons, such as a change in diet, food intolerance, or an underlying condition like IBS. The normal stool may be followed by diarrhea as the digestive system tries to clear out irritants or responds to changes in bowel motility.

2. Why am I constipated but having diarrhea-like symptoms?

This can occur in cases of fecal impaction, where a hard mass of stool is stuck in the rectum or colon, leading to a backup of liquid stool that leaks around the impacted mass, resulting in diarrhea-like symptoms.

3. Does diarrhea empty your bowels?

Diarrhea can help empty the bowels, but it does not necessarily clear out the entire digestive system. Severe or prolonged diarrhea can lead to dehydration and electrolyte imbalances, which may require medical attention and rehydration therapy.

4. Why do I keep passing gas but not pooping?

Passing gas but not pooping can be a sign of constipation or an intestinal blockage. It may also be related to dietary factors, such as consuming gas-producing foods or swallowing air while eating or drinking.


Harvard Health (2024) Bowel Problems Available online at: https://www.health.harvard.edu/topics/bowel-problems

National Cancer Institute (n.d) Gastrointestinal Complications (PDQ®)–Patient Version Available online at: https://www.cancer.gov/about-cancer/treatment/side-effects/constipation/gi-complications-pdq

David Mercer

Dr. David Mercer is a board-certified physician in internal medicine and general practice. He has over 20 years of experience working in hospital settings, clinics, and private practice providing comprehensive care to patients.

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