Stomach pain during pregnancy is extremely common, and most of the time it comes from your body stretching, shifting, and adjusting to make room for a growing baby. Hormonal changes, digestive slowdowns, and ligament strain account for the vast majority of aches and cramps you’ll feel. That said, certain types of pain signal something more serious, and knowing the difference matters. Where the pain is, when it started, how intense it feels, and what other symptoms come with it all help you figure out what’s going on.
Hormones Slow Your Entire Digestive System
One of the earliest and most persistent sources of stomach discomfort in pregnancy is digestive. Your body ramps up production of progesterone and a hormone called relaxin, both of which relax smooth muscle tissue throughout your body, including the muscles that move food through your digestive tract. Everything slows down: your stomach empties more slowly, your intestines take longer to do their job, and the result is bloating, gas, and constipation that can feel like genuine stomach pain.
These same hormones also loosen the muscle at the top of your stomach that normally keeps acid from creeping up into your esophagus. That’s why heartburn becomes so common, sometimes as early as the first trimester but typically worsening as pregnancy progresses and the uterus pushes upward against the stomach. The discomfort can range from a mild burning sensation to sharp upper-abdominal pain that mimics something more worrying.
If your pain comes with bloating, difficulty having a bowel movement, or a burning feeling behind your breastbone, digestion is the most likely culprit. Eating smaller meals, staying hydrated, and keeping fiber in your diet helps, though some degree of digestive discomfort is almost unavoidable.
Round Ligament Pain
Two thick bands of tissue called round ligaments run from the front of your uterus down into your groin. As your uterus grows, these ligaments stretch, and the sensation can be surprisingly sharp. Round ligament pain most commonly shows up during the second trimester (weeks 14 through 27), though it can appear earlier or later. Women typically describe it as a sudden stabbing or pulling sensation on one or both sides of the lower abdomen.
The pain usually lasts only a few seconds to a few minutes and is triggered by quick movements: standing up too fast, rolling over in bed, coughing, sneezing, or laughing. It’s completely harmless but can be startling the first time it happens. Moving more slowly during position changes and supporting your belly when you sneeze or cough can reduce the intensity.
First Trimester Pain: What’s Normal, What’s Not
Mild cramping in the first trimester is common as the uterus begins expanding. It often feels similar to period cramps and, on its own, is rarely a cause for concern. Two conditions to be aware of, though, are miscarriage and ectopic pregnancy.
Miscarriage occurs in roughly 10 to 20 percent of known pregnancies, with 80 percent of those happening before the 12th week. Cramping accompanied by vaginal bleeding, especially if the bleeding is heavy or contains tissue, warrants immediate attention. Mild spotting with light cramping can be normal in early pregnancy, so the combination and severity of symptoms matters.
Ectopic pregnancy, where a fertilized egg implants outside the uterus (usually in a fallopian tube), causes symptoms within the first few weeks. The pain is often sharp or stabbing, felt on one side of the pelvis or lower abdomen, and may come and go or be constant. If the ectopic pregnancy ruptures, pain can radiate to the shoulder or neck. This is a medical emergency. Any sharp one-sided pain in early pregnancy, particularly with dizziness or lightheadedness, needs evaluation right away.
Second and Third Trimester Causes
As pregnancy advances, the list of possible causes shifts. Your growing uterus puts increasing pressure on surrounding organs, muscles, and ligaments, which alone can produce aches across the abdomen, lower back, and pelvis. But a few specific conditions become relevant in the later months.
Braxton Hicks Contractions
These “practice contractions” can start as early as the second trimester but are more noticeable in the third. They feel like a tightening of the abdomen, often focused in one area rather than spreading across the whole uterus. The intervals between them are irregular, they don’t get progressively stronger, and changing your position or going for a short walk often makes them stop. Real labor contractions, by contrast, start at the top of the uterus and move downward in a coordinated wave. They get closer together over time, grow stronger, and don’t let up when you change activities.
Placental Abruption
Placental abruption, where the placenta separates from the uterine wall before delivery, causes abdominal and back pain that begins suddenly. The uterus may feel rigid or extremely tender to the touch, and vaginal bleeding is common though not always present. This is rare but serious and requires emergency care.
Preeclampsia
Preeclampsia typically develops after 20 weeks and involves high blood pressure along with signs of organ stress. The abdominal pain it causes is concentrated under the ribs on the right side or in the upper abdomen. It often comes alongside swelling in the face and hands (beyond the normal foot swelling of pregnancy), vision changes like blurred or double vision, flashing lights or spots, and severe headaches. Pain in this location with any of these accompanying symptoms needs urgent evaluation.
UTIs Can Cause Abdominal and Side Pain
Urinary tract infections are more common during pregnancy, and while the classic symptoms are burning with urination and frequent urges to go, they can also cause lower abdominal cramping and pain along your side. The real concern is when a UTI travels to the kidneys, which happens more easily during pregnancy because of those same hormonal changes that slow everything down. A kidney infection brings fever, back pain, chills, and nausea or vomiting. Left untreated, kidney infections during pregnancy can lead to complications, so side pain paired with fever or chills shouldn’t be brushed off as a normal pregnancy ache.
Pain Patterns That Need Immediate Attention
Most pregnancy-related stomach pain is manageable and benign, but certain combinations of symptoms call for prompt medical evaluation:
- Severe or sudden-onset pain that doesn’t ease with rest or position changes, especially if the abdomen feels rigid or tender
- Vaginal bleeding paired with cramping, at any stage of pregnancy
- Pain under the right ribs with vision changes, facial swelling, or a severe headache
- Sharp one-sided pelvic pain in the first trimester, particularly with dizziness
- Fever with back or side pain, which may indicate a kidney infection
- Regular contractions before 37 weeks that get closer together and stronger over time
How to Assess Your Stomach Pain
When you notice pain, a few quick questions can help you gauge what’s happening. Where exactly is the pain? Generalized aching across the abdomen points toward ligament strain, gas, or digestion. Pain concentrated on one side, under the ribs, or in the back suggests something more specific. How long does it last? Seconds to a few minutes with an obvious trigger (sneezing, standing quickly) is classic round ligament pain. Pain that persists for hours or intensifies steadily is worth tracking.
What else is happening? Pain that comes with bleeding, fever, vision changes, or a rigid abdomen moves it out of the “probably normal” category. And how far along are you? Early pregnancy pain has a different set of likely causes than third-trimester pain, so the timing helps narrow things down considerably. Keeping a mental note of these details also makes it much easier to describe what’s going on if you do call your provider.