What causes Abdomen - swollen?
Last updated September 6, 2026.
**Your abdomen can swell from gas, constipation, or large meals, but persistent swelling can have other medical causes.** Food intolerance, irritable bowel syndrome, and menstrual changes can cause bloating that comes and goes. Pregnancy and weight gain can also make your abdomen larger. Swelling that persists or worsens needs a clinician's evaluation because fluid buildup, a bowel blockage, or a growth can also cause it. For mild bloating after meals, try smaller portions, eat slowly, and limit carbonated drinks.
What to do
- **Adjust your meals:** Eat smaller portions slowly to reduce fullness and swallowed air.
- **Track your symptoms:** Note whether swelling follows particular foods, constipation, or your period.
- **Reduce swallowed air:** Limit carbonated drinks and avoid chewing gum or drinking through straws.
- **Arrange an evaluation:** See a clinician for swelling that persists, worsens, or accompanies unexplained weight loss.
- **Get urgent care:** Seek prompt medical care for swelling with fever, vomiting, or inability to pass stool or gas.
- **Get emergency help:** Go to the ER for sudden severe belly pain or vomiting blood, and call 911 for severe trouble breathing.
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