Overview
Bowel obstruction and constipation both cause abdominal discomfort and difficulty passing stool, but bowel obstruction is a medical emergency with severe, sudden symptoms like vomiting and total blockage. Constipation is more common and typically milder, involving infrequent, hard stools and straining.
Disease Summaries
Bowel Obstruction: This happens when the intestines are blocked, for example, by tumors or scar tissue from past surgeries. Quick medical attention is necessary.
Constipation: This refers to difficulty in passing stool. Constipation can also refer to a decrease in stool quantity (e.g. passing stool every day but only small amounts). It can be caused by various factors, including dietary habits, mobility, illnesses, and medications.
Comparing Symptoms
Overlapping Symptoms
- Abdominal discomfort or cramping
- Bloating
- Reduced or difficult bowel movements
Bowel Obstruction Specific Symptoms
- Sudden, severe abdominal pain
- Inability to pass gas or stool
- Vomiting (often with a fecal odor)
- Swollen or firm abdomen
- High-pitched bowel sounds or absence of bowel sounds
- Rapid heart rate and dehydration
Constipation Specific Symptoms
- Infrequent stools (fewer than 3 per week)
- Straining during bowel movements
- Hard, dry, or lumpy stools
- Feeling of incomplete evacuation
- Mild abdominal discomfort
Treatment Approaches
Bowel Obstruction Treatment Approaches
Treatment relies on the severity and location of the obstruction. In mild cases, fasting might be enough; this is done in the hospital with fluids given through a needle in the vein and close monitoring. In severe cases, a tube may need to be inserted through the nose or mouth into the stomach to relieve pressure and pain. Some cases may also require surgery to remove the obstruction.
Constipation Treatment Approaches
Treatment depends on the cause and severity. Mild cases can be managed with lifestyle changes like increasing water intake, high-fiber foods, and physical activity. Laxatives and enemas can also be used. Constipation caused by a blockage or tumor may require surgery.
Reviewed By:

Kenji Taylor, MD, MSc (Family Medicine, Primary Care)
Dr. Taylor is a Japanese-African American physician who grew up and was educated in the United States but spent a considerable amount of time in Japan as a college student, working professional and now father of three. After graduating from Brown, he worked in finance first before attending medical school at Penn. He then completed a fellowship with the Centers for Disease Control before going on to specialize in Family and Community Medicine at the University of California, San Francisco (UCSF) where he was also a chief resident. After a faculty position at Stanford, he moved with his family to Japan where he continues to see families on a military base outside of Tokyo, teach Japanese residents and serve remotely as a medical director for Roots Community Health Center. He also enjoys editing and writing podcast summaries for Hippo Education.

Aiko Yoshioka, MD (Gastroenterology)
Dr. Yoshioka graduated from the Niigata University School of Medicine. He worked as a gastroenterologist at Saiseikai Niigata Hospital and Niigata University Medical & Dental Hospital before serving as the Deputy Chief of Gastroenterology at Tsubame Rosai Hospital and Nagaoka Red Cross Hospital. Dr. Yoshioka joined Saitama Saiseikai Kawaguchi General Hospital as Chief of Gastroenterology in April 2018.
Content updated on Apr 27, 2025
Following the Medical Content Editorial Policy
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https://www.sciencedirect.com/science/article/abs/pii/S0889855318300657?via%3DihubBlack CJ, Ford AC. Chronic idiopathic constipation in adults: epidemiology, pathophysiology, diagnosis and clinical management. Med J Aust. 2018 Jul 16;209(2):86-91. doi: 10.5694/mja18.00241. PMID: 29996755.
https://onlinelibrary.wiley.com/doi/abs/10.5694/mja18.00241Jackson PG, Raiji MT. Evaluation and management of intestinal obstruction. Am Fam Physician. 2011 Jan 15;83(2):159-65. PMID: 21243991.
https://www.aafp.org/pubs/afp/issues/2011/0115/p159.html