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Most people treat stomach trouble as background noise. A bit of bloating after a late dinner, a sprint to the bathroom before a meeting, a dull ache that appears every few weeks and then fades. Usually it settles on its own.
The trouble is that the digestive tract is bad at shouting. It whispers first. A change in bowel habits, four kilos you didn’t mean to lose, a nagging pain low on the right side. Those whispers are easy to explain away until they aren’t.
Here are seven that cross the line from annoying to worth a doctor’s appointment.
1. Blood in Your Stool, or Stool That Looks Like Tar
Bright red streaks on toilet paper are usually a fissure or a haemorrhoid, both common and both treatable. The version that needs a same-week call looks different: blood mixed through the stool, water that turns pink, or stool that comes out black, sticky and smelling faintly metallic. That black colour means blood has sat in the upper gut long enough to be digested.
Either pattern deserves a conversation, particularly if you’re over 45 or have a parent or sibling with colorectal cancer or inflammatory bowel disease.
Details that change the urgency
Note whether there’s mucus, whether you’re getting up at night to go, and whether the blood is brand new or has been coming and going for months. Ongoing bleeding plus cramping is a picture doctors investigate properly rather than watch.
2. Pain That Wakes You Out of Sleep
A cramp after a heavy meal is normal. Pain that pulls you awake at 3 a.m. is not, and clinicians treat it seriously for one simple reason: functional conditions like IBS rarely wake people from deep sleep, while inflammation, ulcers, gallstones and strictures often do.
Where it hurts matters. Pain that begins near the navel and drifts to the lower right is the classic appendicitis pattern. Pain boring into the upper right abdomen an hour after a fatty meal points toward the gallbladder. A burning ache between meals that eases when you eat suggests an ulcer rather than reflux.
If the ache has been present for three weeks or more, or has changed character recently, it’s worth reading up on the common causes of persistent abdominal pain so you can describe the location and timing accurately at your appointment.
3. Weight Loss You Didn’t Plan
Losing 5% of your body weight over six to twelve months without trying is a red flag that doctors take seriously. For someone at 80kg, that’s four kilos. Clothes getting loose without effort isn’t a win if you’re also eating normally.
Unintended weight loss plus gut symptoms can reflect poor absorption. Coeliac disease, chronic pancreatitis and untreated inflammation in the small bowel all interfere with how nutrients are taken up, which is why someone can eat well and still slide downward on the scale.
4. A Lasting Change in Bowel Habits
Everyone has an off week. What matters is a shift that holds for four weeks or longer: three loose stools a day when you used to go once, new constipation that doesn’t respond to fibre and water, or stools that have become thin and pencil-like.
Urgency is another signal. Needing to reach a bathroom within minutes, or accidents you’d rather not discuss, suggests the rectum or colon is inflamed. Conditions such as Crohn’s disease and ulcerative colitis often begin exactly this way in people in their twenties and thirties, and early treatment changes the long-term course.
One under-discussed trigger: a course of antibiotics. A single prescription can shift the bacterial population in your gut for months, and some people develop loose stools and cramping that never quite settle afterwards. The research on how repeated antibiotic use disrupts gut microbes is a useful starting point if your symptoms began after a chest infection or dental procedure.
5. Food That Sticks, or Comes Back Up
Swallowing trouble is never something to wait out. If solid food feels like it’s catching behind the breastbone, if you need a glass of water to push each mouthful down, or if you’ve started losing weight because eating has become a chore, get assessed. Narrowing of the oesophagus from acid damage, strictures and, less often, tumours all present this way.
Vomiting that repeats over days, vomit containing blood or coffee-ground material, or projectile vomiting after meals also needs prompt attention, not a change of diet.
6. Yellow Skin, Pale Stools, Dark Urine
These three often travel together, and together they point at the liver or the bile ducts rather than the stomach. Jaundice shows up first in the whites of the eyes, then the face. Stool turns the colour of putty because bile isn’t reaching the intestine. Urine darkens like strong tea.
Gallstones lodged in the common bile duct, hepatitis and some medication reactions can all produce this combination. It’s a same-day call to a doctor or urgent care, especially with fever or pain under the right ribs.
7. Fever, Chills, or Bone-Deep Fatigue Alongside Gut Symptoms
A temperature of 38°C or higher paired with abdominal pain is a possible infection or abscess, not a stomach bug to sleep off. Add a rigid, tender belly or pain that worsens when you cough, and it’s an emergency department visit.
Constant exhaustion is quieter but still meaningful. Chronic diarrhoea drains iron and B12, and poor absorption can quietly strip away vitamin D, zinc and folate. If fatigue has become your default alongside digestive symptoms, the patterns in this piece on nutritional deficiencies affecting populations worldwide will look familiar, and a simple blood panel can confirm what’s missing.
How to Describe Your Symptoms So You Get Taken Seriously
Vague descriptions get vague answers. A two-week log turns a fuzzy complaint into something a clinician can act on, and it often shortens the path to the right test. Bring notes on:
- Timing. When pain or urgency hits, how long it lasts, and whether it wakes you at night.
- Stool appearance. Use the Bristol Stool Scale (types 1 to 7) so you can say “type 6, three times a day” instead of “loose.”
- Triggers. Specific foods, stress, travel, or a recent course of antibiotics.
- Medications. Include NSAIDs like ibuprofen, iron tablets, PPIs and anything bought over the counter. Regular ibuprofen use is an underrated cause of gut irritation.
- Family history. Bowel cancer, coeliac disease, IBD and pancreatic problems in first-degree relatives all change how quickly a doctor will investigate.
- What you’ve already tried. Two weeks of fibre supplements, a probiotic, cutting out dairy. Say what helped and what did nothing.
One practical note: don’t stop a medication on your own before the appointment, and don’t let a normal-looking blood test talk you out of mentioning symptoms. Digestive conditions frequently hide behind routine results in the early stages. If something has been off for a month, that’s reason enough to book the visit.
