# When to See a Doctor About Your Poop > If you have a question about what you are seeing, that is reason enough to ask. What public health sources say, who to see, and how to get ready. - Publisher: Stooly Resources - Section: Gut health - Published: 2026-10-03 - Updated: 2026-10-03 - Canonical URL: https://stoolyapp.com/resources/when-to-see-a-doctor-about-your-poop ## The short version - You don't need to meet a threshold to ask. A question about your own body is a legitimate reason to talk to a healthcare professional. - Public health sources name a few things to raise: blood in or on your stool, black or tarry stool, a change in bowel habits that lasts, and symptoms that don't go away. - Screening is separate from symptoms. The CDC says most people should begin colorectal cancer screening at age 45. - Primary care is the usual first stop. A gastroenterologist is the specialist for the digestive system. A written record helps either one. People wait. They wait because the subject feels awkward, because it is probably nothing, because they aren't sure who to call. This article doesn't tell you what a change means. No article can. It collects what public health institutions say about when to raise bowel changes with a doctor, and it covers the practical part: who to see and how to prepare. ## Do you need a reason to ask a doctor about your poop? No. If you have a question about what you are seeing, that is enough. The [National Institute on Aging](https://www.nia.nih.gov/health/medical-care-and-appointments/what-do-i-need-tell-doctor) says that worrying about your symptoms is not a sign of weakness, and that being honest about what you are experiencing is not complaining. Clinicians ask about bowel habits as a matter of routine. The [questions NIDDK says doctors ask](https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/diagnosis) include how often you have a bowel movement and what your stools look like. It is an ordinary conversation for them, even if it isn't for you. > A question about your own body is reason enough to ask. ## What changes do health sources say to raise with a doctor? Blood in or on your stool, black or tarry stool, a change in bowel habits that lasts, and symptoms that don't go away are the ones public health sources name most often. Here is what each institution says, in its own terms. - **The CDC** lists [symptoms of colorectal cancer](https://www.cdc.gov/colorectal-cancer/symptoms/index.html) that include a change in bowel habits, blood in or on your stool, diarrhea, constipation or a feeling that the bowel does not empty all the way, abdominal pain or cramps that don't go away, and weight loss you can't explain. Its guidance is to talk to your doctor if you have any of them. - **NIDDK** says to [see a doctor about constipation](https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/symptoms-causes) if your symptoms do not go away with self-care or you have a family history of colon or rectal cancer. It says to see one right away if constipation comes with bleeding from your rectum, blood in your stool, constant abdominal pain, inability to pass gas, vomiting, fever, lower back pain or losing weight without trying. - **NIDDK** also says adults should [talk with a doctor right away about diarrhea](https://www.niddk.nih.gov/health-information/digestive-diseases/diarrhea/symptoms-causes) with symptoms such as lasting more than 2 days, a high fever, or six or more loose stools a day. - **MedlinePlus** says to [contact a provider right away](https://medlineplus.gov/ency/article/003130.htm) if you notice blood or changes in the color of your stool, and to contact one if your stools are [not their normal brown color for several days](https://medlineplus.gov/ency/article/003129.htm). - **The NHS**, in the United Kingdom, [advises seeing a GP](https://www.nhs.uk/conditions/bleeding-from-the-bottom-rectal-bleeding/) if you have had blood in your poo for 3 weeks, or if your poo has been softer, thinner or longer than normal for 3 weeks. - **2 days**: Diarrhea lasting longer than this is something adults should talk with a doctor about right away (NIDDK) - **3 weeks**: Stool that has been softer, thinner or longer than normal for this long is a reason to see a GP (NHS (United Kingdom)) - **45**: The age at which most people should begin screening for colorectal cancer (CDC) The CDC's own caveat is worth repeating: these symptoms may be caused by something other than cancer. Sorting out which is what an appointment is for. > **If it can't wait.** NIDDK says to [seek medical help right away](https://www.niddk.nih.gov/health-information/digestive-diseases/gastrointestinal-bleeding/symptoms-causes) for symptoms of acute gastrointestinal bleeding, which include black or tarry stool, dark or bright red blood mixed with stool, and vomit that is bright red or looks like coffee grounds. If you think you may be having a medical emergency, call 911 or your local emergency number. ## What if you have no symptoms at all? Screening is for people without symptoms. The CDC says most people should begin screening for colorectal cancer at age 45, and the U.S. Preventive Services Task Force recommends screening for adults aged 45 to 75. A screening test looks for a disease when a person doesn't have symptoms, the [CDC explains](https://www.cdc.gov/colorectal-cancer/screening/index.html), and it notes elsewhere that polyps and colorectal cancer don't always cause symptoms. The tests it lists are stool tests, flexible sigmoidoscopy, colonoscopy and CT colonography. Which test, and when, is a conversation to have with a clinician. The [Task Force recommendation](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/colorectal-cancer-screening), issued in May 2021, covers adults aged 45 to 49 and 50 to 75, and says clinicians should selectively offer screening to adults aged 76 to 85. ## Who do you see: primary care or a gastroenterologist? A primary care clinician is the usual first stop, and some insurance plans require a referral from one before you see a specialist. A gastroenterologist is the physician who specializes in the digestive system. | Where | What it is | Source | | --- | --- | --- | | Primary care | The usual first conversation. Some insurance plans require a referral from here before you see a specialist. | HealthCare.gov | | Gastroenterologist | A physician with dedicated training in managing diseases of the gastrointestinal tract and liver. | American College of Gastroenterology | | Emergency care | For symptoms that can't wait. In an emergency, call 911 or your local emergency number. | NIDDK | *Three places a question can go. Sources: HealthCare.gov; American College of Gastroenterology; NIDDK.* According to the [American College of Gastroenterology](https://gi.org/patients/gi-health-and-disease/what-is-a-gastroenterologist/), a gastroenterologist is a physician with dedicated training in managing diseases of the gastrointestinal tract and liver. Whether you can book one directly depends on your plan: HealthCare.gov notes that many HMOs require a [referral](https://www.healthcare.gov/glossary/referral/) first. Our guides cover [how referrals work](https://stoolyapp.com/resources/understanding-referrals-and-specialist-care) and [how to find a gastroenterologist near you](https://stoolyapp.com/resources/how-to-find-a-gastroenterologist-near-you). ## What happens when you get checked? A clinician asks about your history, may examine you, and may order tests. NIDDK says doctors use your medical and family history, a physical exam or medical tests to find the cause of a bowel problem. The tests NIDDK lists for constipation, as one example, include blood tests, stool tests and, in some cases, procedures such as colonoscopy. Stool tests can show the presence of blood and signs of infection and inflammation. This is analysis that a clinician orders and interprets, and it is what turns an observation into an answer. ## How do you prepare for the appointment? Bring specifics: what changed, when it started, how often it happens, and what your stools look like. A short written record covers all four. **What to bring** - [ ] A record of your bowel movements for the past week or two, if you have one. - [ ] The date you first noticed a change. - [ ] A list of your medicines and supplements, including over-the-counter ones. - [ ] Any family history of colon or rectal cancer, or other digestive conditions, that you know of. - [ ] Your questions, most important first. The National Institute on Aging recommends making notes about your symptoms before you call or visit, and its guide to [preparing for an appointment](https://www.nia.nih.gov/health/medical-care-and-appointments/how-prepare-doctors-appointment) suggests listing your concerns in order of priority. Here is [how to keep a simple stool diary](https://stoolyapp.com/resources/how-to-track-your-bowel-movements), and [what the Bristol stool scale describes](https://stoolyapp.com/resources/what-does-normal-poop-look-like), which gives you and the clinician a shared vocabulary. > **Information, not medical advice.** This article summarizes what public health sources say. It can't assess your situation or tell you whether you need care. A healthcare professional can help determine which type of care is appropriate for you. ## Where Stooly fits Stooly is a healthcare navigation platform. It can't tell you whether to see a doctor, and it doesn't assess symptoms. It is designed for the step after you decide to: [finding a gastroenterologist](https://stoolyapp.com/find-a-gastroenterologist) or another doctor who fits your plan, your location and your preferences. ## Questions people ask ### When should I see a doctor about changes in my poop? Public health sources name several things to raise with a doctor, including blood in or on your stool, black or tarry stool, a change in bowel habits that lasts, and symptoms that don't go away. The CDC says to talk to your doctor if you have a change in bowel habits or blood in your stool. Only a healthcare professional can assess your situation. ### Is blood in stool always serious? An article can't tell you that. The CDC notes that symptoms such as blood in or on the stool may be caused by something other than cancer, and MedlinePlus says to contact a health care provider right away if you notice blood in your stool. A clinician can find the cause. ### What kind of doctor do you see for bowel problems? A primary care clinician is the usual starting point. A gastroenterologist is a physician with dedicated training in managing diseases of the gastrointestinal tract and liver, according to the American College of Gastroenterology. Some insurance plans require a referral before you see a specialist. ### At what age should colorectal cancer screening start? The CDC says most people should begin screening for colorectal cancer at age 45. The U.S. Preventive Services Task Force recommends screening for adults aged 45 to 75. A clinician can advise on timing and the type of test. ### How long should a change in bowel habits last before I see a doctor? Sources differ, and none of them replaces a clinician's judgment. NIDDK says adults should talk with a doctor right away about diarrhea lasting more than 2 days. The United Kingdom's NHS advises seeing a GP if your poo has been softer, thinner or longer than normal for 3 weeks. If you have questions sooner, you can ask sooner. ## Sources 1. National Institute on Aging. [What Do I Need to Tell the Doctor?](https://www.nia.nih.gov/health/medical-care-and-appointments/what-do-i-need-tell-doctor). Accessed 2026-10-03. 2. National Institute of Diabetes and Digestive and Kidney Diseases. [Diagnosis of Constipation](https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/diagnosis). Accessed 2026-10-03. 3. Centers for Disease Control and Prevention. [Symptoms of Colorectal Cancer](https://www.cdc.gov/colorectal-cancer/symptoms/index.html). Accessed 2026-10-03. 4. National Institute of Diabetes and Digestive and Kidney Diseases. [Symptoms & Causes of Constipation](https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/symptoms-causes). Accessed 2026-10-03. 5. National Institute of Diabetes and Digestive and Kidney Diseases. [Symptoms & Causes of Diarrhea](https://www.niddk.nih.gov/health-information/digestive-diseases/diarrhea/symptoms-causes). Accessed 2026-10-03. 6. MedlinePlus Medical Encyclopedia. [Black or tarry stools](https://medlineplus.gov/ency/article/003130.htm). Accessed 2026-10-03. 7. MedlinePlus Medical Encyclopedia. [Stools - pale or clay-colored](https://medlineplus.gov/ency/article/003129.htm). Accessed 2026-10-03. 8. NHS. [Bleeding from the bottom (rectal bleeding)](https://www.nhs.uk/conditions/bleeding-from-the-bottom-rectal-bleeding/). Accessed 2026-10-03. 9. National Institute of Diabetes and Digestive and Kidney Diseases. [Symptoms & Causes of GI Bleeding](https://www.niddk.nih.gov/health-information/digestive-diseases/gastrointestinal-bleeding/symptoms-causes). Accessed 2026-10-03. 10. Centers for Disease Control and Prevention. [Screening for Colorectal Cancer](https://www.cdc.gov/colorectal-cancer/screening/index.html). Accessed 2026-10-03. 11. U.S. Preventive Services Task Force. [Colorectal Cancer: Screening (Final Recommendation Statement, May 2021)](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/colorectal-cancer-screening). Accessed 2026-10-03. 12. American College of Gastroenterology. [What is a Gastroenterologist?](https://gi.org/patients/gi-health-and-disease/what-is-a-gastroenterologist/). Accessed 2026-10-03. 13. HealthCare.gov. [Referral (Glossary)](https://www.healthcare.gov/glossary/referral/). Accessed 2026-10-03. 14. National Institute on Aging. [How To Prepare for a Doctor's Appointment](https://www.nia.nih.gov/health/medical-care-and-appointments/how-prepare-doctors-appointment). Accessed 2026-10-03. --- This article is general information, not medical advice. Stooly provides healthcare navigation information and does not provide medical advice, diagnosis, or treatment.