When to See a Doctor Based on Your Stool's Appearance

Changes in bowel movements can be a source of concern, but understanding what is normal for an individual and when to seek medical attention is key. Stool characteristics can vary based on diet, hydration, physical activity, and medications.

Unusual Colors and Their Meanings

Black or tarry stools, if not caused by iron supplements or bismuth medication like Pepto-Bismol, can indicate bleeding from an upper gastrointestinal source, such as the esophagus, stomach, or small intestine. This warrants a doctor's visit, according to Jeffery M. Nelson, surgical director at the Center for Inflammatory Bowel and Colorectal Diseases at Mercy Medical Center.

Bright red blood in the stool, whether on toilet paper, in the water, or streaked within the stool, may suggest bleeding from the anal canal or lower rectum. Conditions like internal hemorrhoids, anal fissures, rectal polyps, or rectal cancers can cause this, and a doctor should be consulted.

Maroon-colored stools, often accompanied by a more liquid consistency and a distinct odor, can signal bleeding from the end of the small bowel or the colon. Nelson notes that diverticulosis and arteriovenous malformations are common causes, and this may require an emergency room visit.

Pale, oily stools with a particularly foul smell, a condition known as steatorrhea, indicate excess fat in the stool. This can be a sign of malabsorption syndromes, pancreatic insufficiency, or biliary disease, potentially leading to deficiencies in fat-soluble vitamins (A, D, E, and K). Chris Carrubba, an internal medicine doctor, advises that this finding requires medical attention.

Changes in Consistency and Frequency

Significant changes in stool consistency, such as a shift from typical long, sausage-like stools to pencil-thin ones, could indicate an inflammatory condition like Crohn's disease or an infection. Karen Soika, a general surgeon, suggests discussing such changes with a doctor.

Watery diarrhea can be a symptom of various issues. If it occurs after a camping trip, it might be due to Giardia, a protozoal organism found in contaminated water. Giardiasis can cause abdominal pain and persistent watery diarrhea, treatable with antimicrobials. Exposure can also occur through uncooked produce rinsed in contaminated water or improper hand hygiene.

Mucus in the stool typically points to inflammation of the intestines, according to gastroenterologist Peyton Berookim. This can be associated with inflammatory bowel diseases (ulcerative colitis or Crohn's), bacterial infections, or irritable bowel syndrome (IBS). Mucus accompanied by blood or abdominal pain requires medical evaluation.

Hard or infrequent stools signify constipation, often due to low fiber or water intake. However, it can also be related to medications, intestinal blockages, or, less commonly, colon cancer. Jack Braha, a gastroenterologist, recommends starting with increased fiber and water intake. For persistent symptoms, especially after age 50, a gastroenterologist can assess the need for further testing, such as a colonoscopy.

Loose, watery, or frequent stools (diarrhea) are common after consuming contaminated food or due to infection, usually resolving within a week. If diarrhea persists for over two weeks, or is accompanied by bleeding, weight loss, or nighttime symptoms, it warrants further investigation. Braha states that non-infectious diarrhea causes can include lactose intolerance, IBS, inflammatory bowel disease, or celiac disease, often diagnosed through tests and colonoscopy.

In general, any persistent or concerning changes in bowel movements should be discussed with a healthcare provider.