Right-sided pain during pregnancy is extremely common and usually caused by the normal stretching of ligaments and muscles as your uterus grows. But because several serious conditions also produce right-sided pain, knowing the difference matters. The location of the pain, when it started, and how long it lasts can help you tell routine discomfort from something that needs medical attention.
Round Ligament Pain: The Most Common Cause
Two rope-like bands of tissue, each about 10 to 12 centimeters long, connect your uterus to your lower abdominal wall through the groin. As your uterus expands, these ligaments stretch and sometimes spasm, producing a sharp, stabbing sensation on one or both sides of your lower pelvis or groin. It tends to hit when you stand up quickly, cough, sneeze, or roll over in bed.
Round ligament pain typically shows up during the second trimester (weeks 14 through 27), when the uterus is growing fastest, though it can appear earlier or later. The key feature is that it lasts only a few seconds to a few minutes. If it persists for more than a couple of hours, that points toward something else.
Gallbladder Problems
Pregnancy hormones slow the gallbladder’s ability to empty, and the risk of forming gallstones rises significantly. Nearly 8% of pregnant women develop new gallstones by the third trimester, though only about 1% experience symptoms. When symptoms do appear, they feel like intense pain in the right upper abdomen or just below the ribs, often after a fatty meal. The pain can radiate to the right shoulder or back and may come with nausea or vomiting.
This type of pain, called biliary colic, tends to last 30 minutes to several hours, which distinguishes it from the brief jolt of round ligament pain. If you’re having an episode, avoiding food and drink until it passes can help. Fewer than 10% of pregnant women with symptomatic gallstones develop complications, but recurrent attacks sometimes require treatment.
Right Kidney Swelling
The right kidney is more prone to swelling during pregnancy than the left. This happens because the growing uterus presses the tube that drains urine (the ureter) against the bony rim of your pelvis, and the anatomy on the right side makes compression more likely. The swelling typically develops during the second trimester and resolves within a few weeks after delivery.
You might feel a dull ache or pressure in your right flank or side, sometimes extending toward your back. If a kidney infection develops on top of the swelling, you’ll notice fever, chills, and pain that becomes sharp. A urinary tract infection that reaches the kidney needs prompt treatment because it can trigger preterm contractions.
Appendicitis in Pregnancy
Appendicitis doesn’t become more common during pregnancy, but it can be harder to recognize. A long-held belief was that the growing uterus pushes the appendix upward as pregnancy progresses, moving the pain higher on the right side. More recent research challenges this: in about 82% of pregnant women studied, the appendix stayed in its normal lower-right position regardless of gestational age.
That means appendicitis pain in pregnancy usually starts near the belly button and settles into the lower right abdomen, just like it does outside of pregnancy. The pain is constant rather than coming and going, worsens over hours, and is often accompanied by loss of appetite, nausea, or a low-grade fever. Because the stakes are high for both you and the baby, persistent right-lower pain that gets worse deserves prompt evaluation.
Preeclampsia and HELLP Syndrome
Right upper abdominal pain after 20 weeks of pregnancy can signal preeclampsia or a related condition called HELLP syndrome. Both involve the liver swelling under strain. Up to 10% of women with severe preeclampsia show signs of liver stress, and 90% of women who develop the liver-related complications report right upper quadrant pain as a primary symptom.
HELLP stands for hemolysis (red blood cells breaking apart), elevated liver enzymes, and low platelet counts. It develops when tiny blood vessel damage spreads to the liver. Severe right upper abdominal pain that comes on suddenly can indicate dangerous swelling of the liver and needs emergency evaluation.
Other signs that point toward preeclampsia include a persistent headache that doesn’t respond to pain relief, visual changes like seeing spots or blurring, sudden swelling of the face or hands, and blood pressure readings of 140/90 or higher. You won’t always know your blood pressure at home, which is one reason prenatal visits check it routinely.
Ectopic Pregnancy in Early Weeks
If you’re in the first trimester and experiencing sharp pain on one side, ectopic pregnancy is a possibility. This occurs when a fertilized egg implants outside the uterus, most often in the right or left fallopian tube. Early signs include one-sided pelvic pain and light vaginal bleeding. As the ectopic pregnancy grows, pain becomes more severe.
If the tube ruptures, symptoms escalate rapidly: heavy internal bleeding causes extreme lightheadedness, fainting, or shoulder pain (a sign that blood is irritating the diaphragm). This is a medical emergency. Any combination of sharp one-sided pain and vaginal bleeding in early pregnancy warrants immediate care.
Musculoskeletal Pain
As pregnancy shifts your center of gravity forward, the muscles and joints on one side of your body can take more strain than the other, especially if you favor one side when standing or sleeping. Pelvic girdle pain can produce sudden shooting, burning, or stabbing sensations in the front or back of the pelvis, sometimes worse on the right. This tends to flare with activities like climbing stairs, getting out of a car, or turning over in bed.
Several stretches can help relieve this kind of pain. The cat-cow stretch (on hands and knees, rounding your back, then flattening it) loosens the lower back. Curling backward toward your heels with arms extended stretches the back, pelvis, and thighs. Standing pelvic tilts, where you press the small of your back flat against a wall and hold for several seconds, target the same area. A gentle torso rotation while sitting cross-legged can relieve tension in the upper back. Starting slowly and working up to about 10 repetitions per day is a reasonable pace for most pregnant women.
How to Tell What’s Serious
The pattern of pain is the most useful clue. Brief, sharp twinges triggered by movement that resolve in seconds to minutes are almost always round ligament or musculoskeletal pain. Pain that is constant, worsening over hours, or accompanied by other symptoms needs attention.
Seek immediate care for any of these:
- Severe abdominal pain that doesn’t go away, especially if it started suddenly or is getting worse over time
- Vaginal bleeding paired with sharp pelvic pain, particularly in the first trimester
- Right upper abdominal pain with headache, vision changes, or facial swelling after 20 weeks
- Fever and flank pain, which may signal a kidney infection
- Extreme lightheadedness, fainting, or shoulder pain, which can indicate internal bleeding
Pain that falls somewhere in between, not an emergency but not resolving with rest or position changes, is still worth mentioning at your next prenatal visit. Your provider can check blood pressure, urine, and blood work to rule out the conditions that matter most.