Stomach pain (or “abdominal pain”) has many possible causes, ranging from mild and temporary to serious and urgent. Most short‑lived pain comes from the digestive system, but other organs can be involved too.

Common everyday causes

These are the causes doctors most often see when someone says “my stomach hurts.”

  • Digestive issues: Indigestion, gas, bloating, constipation, or diarrhea can all cause crampy or burning pain that may come and go, often linked with meals or bowel movements.
  • Food-related problems: Food poisoning, gastroenteritis (“stomach flu”), food allergies, and food intolerances (like lactose intolerance) can cause pain, nausea, vomiting, and loose stools.
  • Acid and ulcers: Acid reflux/GERD and peptic ulcers can cause burning pain or discomfort in the upper abdomen or chest, sometimes worse after eating or when lying down.

Inflammation and organ problems

Sometimes the pain is due to inflammation or disease in organs in or near the abdomen.

  • Appendicitis: Starts often as vague central pain that may move to the lower right side, usually worsening with time and sometimes with fever or nausea; this is an emergency.
  • Gallbladder and bile ducts: Gallstones or gallbladder inflammation can cause sharp upper right abdominal pain, often after fatty meals, sometimes radiating to the back or shoulder.
  • Pancreatitis: Inflammation of the pancreas can cause severe upper abdominal pain that may radiate to the back, with nausea or vomiting.
  • Liver, kidney, or urinary tract problems: Hepatitis, kidney infections or stones, and urinary tract infections can lead to pain in the side, back, lower abdomen, or generalized abdominal discomfort.
  • Inflammatory bowel disease: Crohn’s disease and similar conditions cause chronic abdominal pain, diarrhea, weight loss, and fatigue.

Reproductive and other non‑gut causes

Not all “stomach” pain actually comes from the stomach or intestines.

  • Menstrual and gynecologic causes: Menstrual cramps, ovulation pain, endometriosis, ovarian cysts, ectopic pregnancy, and pelvic infections can all present as lower abdominal pain.
  • Heart and blood vessel issues: Heart attacks, angina, and abdominal aortic aneurysm can sometimes feel like upper abdominal or central abdominal pain rather than classic chest pain; these are medical emergencies.
  • Other systemic causes: Conditions like diabetes complications (for example, diabetic ketoacidosis), some cancers, and lead poisoning can cause abdominal pain among other symptoms.

How doctors “read” stomach pain

Doctors pay close attention to where the pain is, how it feels, and what comes with it.

  • Location clues:
    • Upper right: Often gallbladder or liver, sometimes lung or heart.
* Upper middle/left: Stomach, pancreas, or heart‑related problems.

* Lower right: Often appendicitis but also ovary or bowel issues.

* Lower abdomen: Colon, bladder, or reproductive organs.
  • Timing and triggers: Pain after eating, at night, during periods, or after certain foods points to different causes.
  • Acute vs chronic: Sudden severe pain can signal emergencies (like appendicitis or obstruction), while pain lasting weeks to months can suggest chronic conditions such as IBS, ulcers, or inflammatory bowel disease.

Here is a compact overview table:

html

<table>
  <tr>
    <th>Type of cause</th>
    <th>Examples</th>
    <th>Typical features</th>
  </tr>
  <tr>
    <td>Digestive (common)</td>
    <td>Indigestion, gas, constipation, diarrhea, food poisoning, food intolerance</td>
    <td>Crampy or bloating pain, often linked with meals or bowel movements, may improve in days</td>
  </tr>
  <tr>
    <td>Acid/ulcer</td>
    <td>GERD, peptic ulcer</td>
    <td>Burning upper abdominal or chest pain, often after eating or when lying down</td>
  </tr>
  <tr>
    <td>Inflammation / infection</td>
    <td>Appendicitis, gallbladder inflammation, pancreatitis, gastroenteritis, kidney infection, UTI</td>
    <td>Localized or severe pain, may have fever, vomiting, or feeling very unwell</td>
  </tr>
  <tr>
    <td>Chronic gut conditions</td>
    <td>Irritable bowel syndrome, Crohn’s disease</td>
    <td>Recurrent pain with bowel changes, sometimes weight loss or fatigue</td>
  </tr>
  <tr>
    <td>Reproductive causes</td>
    <td>Menstrual cramps, endometriosis, ovarian cysts, ectopic pregnancy</td>
    <td>Lower abdominal or pelvic pain, often related to menstrual cycle or pregnancy</td>
  </tr>
  <tr>
    <td>Other serious causes</td>
    <td>Heart attack, abdominal aortic aneurysm, some cancers</td>
    <td>Severe or unusual pain, often with other concerning symptoms (shortness of breath, faintness, weight loss)</td>
  </tr>
</table>

When stomach pain is an emergency

You should seek urgent medical help or emergency care right away if any of the following happen with stomach pain:

  • Sudden, severe, or “worst ever” pain
  • Pain after a hard blow to the abdomen
  • Pain with chest pain, shortness of breath, or sweating
  • Swollen, hard, or very tender belly
  • Vomiting blood or material that looks like coffee grounds
  • Black, tarry, or bloody stools
  • High fever, chills, or feeling very weak or faint
  • Inability to pass gas or stool with worsening pain

If pain is mild but lasts more than a few days, keeps coming back, or interferes with daily life, arranging a non‑urgent doctor visit is still very important.

Important: Stomach pain has many possible causes, and even doctors often need an exam and tests to know the exact reason. Online information can guide you on what’s possible , but it cannot replace in‑person medical care.

If you describe your exact symptoms (where the pain is, how long, what makes it better or worse, plus any other symptoms), I can help you think through what kinds of causes are more or less likely—but you should still see a healthcare professional for a definite diagnosis.