A sudden, stabbing stomach pain is one that’s hard to ignore, especially when it can be linked to almost anything—from a bad batch of takeout food to serious health conditions like appendicitis. So it’s completely normal to think to yourself: “Why does my stomach hurt?” The reality is, that there are many reasons for abdominal pain. Keep reading to understand different types and common causes of stomach pain so the next time a rumbly tummy arises, you can be prepared.

What is stomach or abdominal pain?

“Abdominal pain is pain that you feel between the chest and the groin,” explains gastroenterologist Dr David Greenwald. And while it’s commonly referred to as a stomach ache, the pangs don’t always come from that very organ. They can actually originate within the abdominal wall or any of the gastrointestinal organs including the liver, gallbladder, pancreas, small and large intestines, and appendix, says family medicine specialist Dr Indira Mahidhara. Some stomach pain is even linked back to the chest (i.e. pneumonia or pulmonary embolism), the urinary tract, and even migraines, she adds.

Stomach pain also varies in intensity from mild to severe, and can manifest as many different sensations, including a knife-like sharp or dull achy pain, burning, squeezing, and spasms, adds Dr Mahidhara.

Common stomach pain causes

Around 40% of emergency department visits initiated by abdominal pain are reported as having an “undiagnosed cause,” explains Dr Mahidhara. She adds that 30% of those emergency room patients under 50 had an ultimate diagnosis of appendicitis. With that being said, the list of potential stomach ache culprits is pretty extensive. The more common stomach pain causes, according to Dr Greenwald and Dr Mahidhara, are:

Some more complex and sometimes serious causes of stomach pain are:

  • Abdominal aortic aneurysm
  • Appendicitis
  • Bowel obstruction (due to scarring from previous surgeries, hernia, or cancer)
  • Crohn’s disease
  • Diverticulitis
  • Ectopic pregnancy
  • Gall stones or gallbladder disease
  • Hernia
  • Infarction (reduced or cut off blood flow to the intestines)
  • Ovarian torsion
  • Pelvic inflammatory disease
  • Ulcers
  • Urinary tract infection
  • Cancer
  • Celiac disease
  • Viral hepatitis

Symptoms associated with abdominal pain vary depending on cause, but may include fever, lack of appetite, weight gain or loss, difficulty swallowing, chest pain or burning, bloating, fullness, nausea or vomiting, constipation, diarrhoea, black or bloody stools, burning with urination, blood in the urine, back pain, rash, jaundice, and bruising, says Dr Mahidhara.

How is stomach pain diagnosed?

Most abdominal pain issues can be diagnosed with a careful health history review and physical exam, explains Dr Greenwald, who adds that “the vast majority are not serious.” In some cases, additional testing may be required to fully understand the underlying problem, which may include blood analyses, stool and urine samples, and imaging of the abdomen via radiographs, ultrasounds, and CT scans.

How to treat minor stomach pain at home

“Treatment depends on the underlying problem, of course,” explains Dr Greenwald. But your run-of-the-mill antacids and diet modifications (think: the BRAT diet) are standard go-tos for relief, he says. Hydration, “even frequent sips of fluids,” is also crucial amid diarrhoea, adds Dr Mahidhara, and anti-inflammatory medications and a heating pad should help soothe abdominal cramps. Just be careful with medications, she advises, “because they may help or worsen a situation depending on the cause.”

How to know when stomach pain is serious (and when to see a doctor)

If things take a turn for the worst and symptoms like increased pain, fever, profuse vomiting, bloody diarrhoea, or the development of a rigid, “board-like” abdomen surface, Dr Greenwald says to seek urgent medical attention. Other alarming signs to keep an eye out for, according to Dr Mahidhara, are a change in mental status, lethargy or weakness, and decreased urination. If these symptoms arise, or acute abdominal pain simply persists over a few days, seek treatment right away.

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