Stomach pain during pregnancy is extremely common, and most of the time it comes from your body stretching and adjusting to make room for a growing baby. That said, the cause depends a lot on where you feel the pain, how intense it is, and how far along you are. Some types of pain are completely harmless, while others signal something that needs immediate attention.
Round Ligament Pain: The Most Common Culprit
Your uterus is held in place by thick bands of tissue called round ligaments. As the uterus expands rapidly, these ligaments stretch, and that stretching creates what many pregnant people describe as the most frequent source of belly pain during pregnancy. Round ligament pain typically shows up during the second trimester, between weeks 14 and 27, though it can start earlier.
The sensation varies. Some people feel a dull ache or cramp, while others get a sharp, stabbing, or pulling feeling, usually on one or both sides of the lower belly or groin. The hallmark of round ligament pain is that it’s triggered by sudden movement: standing up too quickly, rolling over in bed, sneezing, coughing, laughing, or exercising. It tends to be brief, lasting a few seconds to a minute, and goes away on its own. Slowing down your movements and supporting your belly when you sneeze or cough can help.
Braxton Hicks Contractions
Starting in the second or third trimester, you may notice your belly tightening and then relaxing. These are practice contractions, often called Braxton Hicks, and they can feel like mild menstrual cramps or a general squeezing sensation. They’re not dangerous, but they can be uncomfortable enough to make you wonder if something is wrong.
The key difference between Braxton Hicks and real labor contractions is their pattern. Practice contractions are irregular, don’t get closer together over time, and don’t increase in intensity. They often stop if you change positions, lie down, or drink water. True labor contractions come at regular intervals, get progressively stronger, and continue no matter what you do. If you’re unsure, time them for an hour. Contractions that keep coming every five minutes and don’t respond to rest or hydration are worth a call to your provider.
First Trimester Pain
Mild cramping in early pregnancy is normal as the embryo implants and the uterus begins to grow. It often feels similar to period cramps and comes and goes without worsening. But the first trimester is also when the most concerning obstetric causes of pain arise: miscarriage and ectopic pregnancy.
An ectopic pregnancy happens when a fertilized egg implants outside the uterus, usually in a fallopian tube. The first warning signs are typically pelvic pain and light vaginal bleeding. As the situation progresses, pain can become sharp and severe. Some people also feel shoulder pain or a sudden urge to have a bowel movement, which happens when internal bleeding irritates nearby nerves. Severe pelvic pain with vaginal bleeding is a medical emergency.
Miscarriage, which occurs in roughly 10 to 20 percent of known pregnancies, usually involves cramping that intensifies over time along with bleeding that goes beyond light spotting. Not all first-trimester bleeding leads to miscarriage, but any combination of worsening cramps and bleeding warrants prompt evaluation.
Second and Third Trimester Pain
As pregnancy advances, the list of possible causes shifts. Beyond round ligament pain and Braxton Hicks, more serious obstetric conditions can develop.
Placental abruption occurs when the placenta separates from the uterine wall before delivery. The pain is distinctive: it comes on suddenly, often alongside back pain, and the uterus may feel rigid or tender to the touch. Vaginal bleeding is common but not always present. This is a medical emergency that requires immediate care.
Preterm labor, defined as labor before 37 weeks, can start with regular cramping, pelvic pressure, or low back pain. If you notice a pattern of contractions before 37 weeks that doesn’t stop with rest and hydration, contact your provider right away.
Upper Belly Pain and Preeclampsia
Pain in the upper right part of your abdomen, just under the ribs, deserves special attention in the second half of pregnancy. This type of pain can be a sign of preeclampsia, a serious blood pressure condition. Other symptoms include severe headaches, changes in vision (blurred vision, light sensitivity, or temporary vision loss), sudden swelling in the face or hands, and nausea or vomiting. Preeclampsia can progress to a dangerous condition called HELLP syndrome, which involves liver and blood clotting problems. Upper right belly pain combined with any of these other symptoms needs same-day medical evaluation.
Non-Pregnancy Causes That Still Happen
Being pregnant doesn’t make you immune to ordinary stomach problems, and some of them actually become more common or harder to diagnose during pregnancy.
Appendicitis is the most common non-obstetric surgical emergency during pregnancy, occurring in about 1 in 2,000 pregnancies. What makes it tricky is that the growing uterus pushes the appendix upward as pregnancy progresses. Pain that would normally be felt in the lower right abdomen may instead appear in the right flank or even the upper right side during the second and third trimesters, which can be confusing.
Urinary tract infections are also more common during pregnancy and can cause lower abdominal discomfort, a burning sensation when urinating, and a frequent urge to go. If a UTI spreads to the kidneys, symptoms escalate to fever, back or flank pain, chills, and vomiting. A kidney infection during pregnancy needs prompt treatment.
Other common culprits include constipation (which affects most pregnant people at some point due to hormonal changes slowing digestion), gas and bloating, and acid reflux. These are uncomfortable but not dangerous.
Pain That Needs Immediate Attention
Most pregnancy-related stomach pain is harmless, but certain combinations of symptoms indicate a potentially life-threatening situation. The CDC lists the following as urgent maternal warning signs:
- Severe belly pain that doesn’t go away, especially pain that starts suddenly, feels sharp or stabbing, or gets worse over time
- Vaginal bleeding heavier than spotting, or fluid leaking from the vagina
- Fever of 100.4°F or higher
- Severe nausea and vomiting that prevents you from keeping down water for more than 8 hours or food for more than 24 hours
- Severe chest, shoulder, or back pain
Any of these on their own, or combined with belly pain, warrants immediate medical care. Pain that responds to position changes, rest, or hydration is far less likely to be serious. Pain that is constant, worsening, or accompanied by bleeding, fever, or vision changes is the kind that shouldn’t wait.