Digestive Conditions
When digestive symptoms keep coming back, it's natural to wonder whether a named condition is behind them. This guide explains the most common ones in plain English — what they are, how they differ, and when symptoms are worth investigating. It's background to discuss with a doctor, not a way to diagnose yourself.
The conditions covered here
- IBS (irritable bowel syndrome) — a common disorder of gut function, without visible damage to the bowel. IBS guide →
- IBD (inflammatory bowel disease) — Crohn's disease and ulcerative colitis, which involve actual inflammation. IBD explained →
- SIBO (small intestinal bacterial overgrowth) — too many bacteria in the small intestine. SIBO overview →
- "Leaky gut" — a popular term; here's what the science does and doesn't support. Leaky gut and the evidence →
IBS vs IBD: an important difference
These names sound alike but are very different. IBS is a problem with how the gut functions — it causes real symptoms like pain, bloating, and changes in bowel habits, but doesn't damage the bowel. IBD involves genuine inflammation and damage to the digestive tract and is a distinct medical diagnosis. Telling them apart requires a doctor, because the warning signs of IBD (such as blood in the stool and weight loss) need proper assessment.
What these conditions share
Many gut conditions overlap in their everyday symptoms — abdominal pain, bloating, diarrhea, or constipation. That overlap is exactly why self-diagnosis is unreliable and why tracking your pattern over time is so useful when you see a doctor.
Red flags that always need a doctor
- Blood in the stool, or black, tarry stool
- Unexplained weight loss
- A persistent change in bowel habits lasting more than 2–3 weeks
- Symptoms that wake you at night
- A family history of bowel disease
How tracking helps with diagnosis
Functional gut conditions are often identified partly from the pattern of your symptoms — their timing, triggers, and how they change. PoopID records your Bristol type, color, and frequency from a photo, giving you and your doctor a clear history instead of relying on memory.
Important: The articles in this series are educational. Diagnosing a digestive condition requires a healthcare professional. If your symptoms are persistent, severe, or include any red flag, see a doctor.
- Sources:
- NIDDK — Digestive Diseases. niddk.nih.gov
- NHS — IBS, Crohn's disease, Ulcerative colitis. nhs.uk
Frequently asked questions
What's the difference between IBS and IBD?
IBS is a problem with how the gut functions and doesn't damage the bowel. IBD (Crohn's disease and ulcerative colitis) involves real inflammation and damage. They're distinct diagnoses, and only a doctor can tell them apart.
Can I diagnose a gut condition myself?
No. Many digestive conditions share symptoms like pain, bloating, and changes in bowel habits, so self-diagnosis is unreliable. A clinician uses your history and tests to diagnose.
Which gut symptoms always need a doctor?
Blood in the stool, black tarry stool, unexplained weight loss, a persistent change in bowel habits beyond 2-3 weeks, and symptoms that wake you at night.
Is SIBO the same as IBS?
No, though they can overlap and share symptoms. SIBO is an overgrowth of bacteria in the small intestine. A doctor can assess whether SIBO is contributing to your symptoms.
This article is for general information only and is not medical advice. Consult a qualified healthcare professional about any symptom that concerns you.
In this guide series
- IBS: Symptoms, Triggers & How to Manage ItWhat irritable bowel syndrome is, its common symptoms and triggers, and practical ways to manage it.
- IBD Explained: Crohn's Disease vs Ulcerative ColitisHow inflammatory bowel disease differs from IBS, the two main types, and why early diagnosis matters.
- SIBO: Signs, Causes & What HelpsWhat small intestinal bacterial overgrowth is, its symptoms, how it's diagnosed, and what helps.
- Leaky Gut: What the Science Actually SaysWhat 'leaky gut' means, what's established versus unproven, and a balanced look at the evidence.