Stomach pain during pregnancy is extremely common and, in most cases, completely harmless. Your body is undergoing rapid physical changes, from a growing uterus stretching muscles and ligaments to hormonal shifts that slow your entire digestive system. That said, certain types of pain signal something more serious. Knowing the difference between routine discomfort and a red flag can save you a lot of worry.
Why Pregnancy Causes So Much Digestive Discomfort
Two hormones deserve most of the blame: progesterone and relaxin. Relaxin works to loosen smooth muscles throughout your body, including those lining your entire gastrointestinal tract. Progesterone amplifies the effect. The result is a significant slowdown in how quickly food moves through your stomach and intestines, which leads to bloating, gas, and constipation. All three can cause real abdominal pain, sometimes sharp enough to be alarming even though it’s not dangerous.
As your uterus grows, it also physically crowds your digestive organs. Heartburn becomes more frequent because the stomach gets pushed upward, and acid escapes into the esophagus more easily. These changes tend to build gradually, starting mild in the first trimester and peaking in the third.
Round Ligament Pain
Round ligament pain is one of the most recognizable pregnancy discomforts. The round ligaments are two cord-like structures that support your uterus on either side. As the uterus expands, these ligaments stretch and thicken, and the sensation can be surprisingly intense. Most people describe it as a sharp, stabbing, or pulling feeling in the lower abdomen or groin, usually on one side. It often hits when you change positions quickly, sneeze, cough, or laugh.
This type of pain most commonly shows up during the second trimester, between weeks 14 and 27, though it can appear earlier or later. It typically lasts only a few seconds to a minute. If the pain lingers for hours, gets progressively worse, or comes with bleeding or fever, it’s not round ligament pain and needs evaluation.
Braxton Hicks Contractions
Starting in the second or third trimester, you may feel your uterus tighten and release in a way that feels a lot like labor. These are Braxton Hicks contractions, sometimes called “practice contractions.” They can cause a crampy, uncomfortable pressure across your abdomen, and they catch many first-time parents off guard.
The key differences between Braxton Hicks and real labor contractions are predictable. Braxton Hicks are irregular, meaning they don’t follow a pattern or get closer together over time. They vary in length. And they typically stop when you walk around, change positions, or drink water. Real labor contractions, by contrast, are consistently stronger and closer together, last between 30 and 90 seconds each, and don’t let up when you move. If your contractions follow a regular pattern and intensify, that’s worth a call to your provider regardless of how far along you are.
First Trimester Causes to Know About
Mild cramping in early pregnancy is normal. Your uterus is growing rapidly, and the implantation process itself can cause light cramping and spotting. Many people describe it as similar to period cramps.
Ectopic pregnancy is the serious concern in early pregnancy. This happens when a fertilized egg implants outside the uterus, usually in a fallopian tube. Symptoms typically develop between weeks 4 and 12 and include pain low in the abdomen, usually concentrated on one side. It may come with vaginal bleeding, shoulder pain, or dizziness. An ectopic pregnancy cannot continue and requires immediate medical treatment.
Miscarriage cramping can also feel similar to normal early pregnancy discomfort, which makes it hard to distinguish. However, miscarriage cramps tend to be significantly more painful than typical menstrual cramps, especially for people who don’t usually experience much period pain. When cramping is accompanied by heavy bleeding or tissue passing from the vagina, seek care right away.
Later Pregnancy Concerns
Preeclampsia
Preeclampsia is a blood pressure condition that develops after 20 weeks. One of its less well-known symptoms is pain in the upper right side of your abdomen or just below the breastbone. This happens because the condition can affect the liver, causing swelling and inflammation. Upper abdominal pain paired with a headache that won’t go away, vision changes like seeing spots or flashes, or sudden swelling of the hands and face is a combination that needs urgent evaluation.
Placental Abruption
Placental abruption occurs when the placenta partially or fully separates from the uterine wall before delivery. The hallmark symptom is sudden, severe abdominal pain along with a uterus that feels rigid or tender to the touch. Vaginal bleeding often accompanies it, though not always. This is a medical emergency.
When Pain Signals Something Urgent
The CDC identifies several maternal warning signs that require immediate medical care. For abdominal pain specifically, the red flags are pain that is sharp, stabbing, or cramp-like and is severe, sudden in onset, or worsening over time. But abdominal pain rarely exists in isolation when something is truly wrong. Watch for these accompanying symptoms:
- Vaginal bleeding heavier than light spotting, or fluid leaking from the vagina
- Fever of 100.4°F (38°C) or higher
- Vision changes such as blurred vision, bright spots, or flashing lights
- A headache that is severe, won’t resolve, or feels like the worst you’ve ever had
- Extreme swelling of the hands or face
- Dizziness or fainting
- A noticeable decrease in your baby’s movement
Any one of these alongside abdominal pain changes the situation from “probably normal” to “get checked now.”
Relieving Normal Pregnancy Stomach Pain
For gas, bloating, and constipation, eating smaller meals more frequently can reduce the burden on your slowed digestive system. Staying well hydrated and including fiber-rich foods helps keep things moving. Gentle walking after meals also encourages motility.
For heartburn, calcium carbonate antacids (sold as Tums, Rolaids, and similar brands) are a common first-line option during pregnancy. Calcium carbonate doubles as a calcium supplement, but there is an upper limit. If you’re 19 or older, total calcium intake should stay below 2,500 mg per day. Exceeding that amount over time has been linked to low birth weight and a condition called milk-alkali syndrome, which involves dangerously high calcium levels and can lead to kidney problems.
For round ligament pain, slow position changes help. Getting out of bed or off the couch gradually, rather than sitting up quickly, reduces the sudden pull on the ligaments. A warm (not hot) compress on the area and gentle prenatal stretching can also ease the discomfort. For Braxton Hicks, changing position, lying down, or drinking a glass of water usually does the trick.
Most pregnancy-related stomach pain falls into the “uncomfortable but harmless” category. The pattern to watch for is pain that is new, severe, getting worse, or accompanied by other symptoms. Familiar, mild, and intermittent discomfort is almost always your body adjusting to the work of growing a baby.