Pain Lower Abdomen During Pregnancy: Causes & Red Flags

Lower abdominal pain during pregnancy is common and can occur as your uterus grows and your body adapts to pregnancy. Mild cramping, stretching sensations, gas, constipation and round ligament pain are some of the more common causes.

However, abdominal pain can sometimes need medical assessment. The location, severity and duration of the pain, along with symptoms such as bleeding, fever, contractions or reduced fetal movements, can help indicate when you should contact your healthcare professional. This guide explains common causes of lower abdominal pain during each trimester, symptoms that need prompt attention and safe ways to manage mild discomfort.

Mild abdominal discomfort can be a normal part of pregnancy. As the uterus grows, the surrounding muscles, ligaments and organs adjust to accommodate it. Hormonal changes can also slow digestion, contributing to gas and constipation.

Normal pregnancy-related discomfort is generally mild, short-lived and improves with rest, a change in position or other simple measures.

Pain that is severe, persistent, worsening or accompanied by other symptoms should not be assumed to be a normal pregnancy symptom and may require medical evaluation.

The cause of abdominal discomfort can vary depending on the stage of pregnancy.

First Trimester

Mild cramping can occur during early pregnancy as the uterus begins to change. Digestive symptoms are also common because pregnancy hormones can slow movement through the digestive tract.

Common causes include:

• Mild uterine cramping: Some women experience mild, period-like cramping during early pregnancy.
• Gas and bloating: Hormonal changes can slow digestion and cause trapped gas and abdominal discomfort.
• Constipation: Pregnancy-related hormonal changes can contribute to constipation, which may cause cramping or pressure.
• Urinary tract infection: A UTI can cause lower abdominal discomfort, particularly when accompanied by burning or pain during urination, an increased urge to urinate or fever.

Pain in early pregnancy that is severe, persistent or mainly on one side, particularly when accompanied by vaginal bleeding, dizziness or fainting, requires prompt medical assessment because it may occur with an ectopic pregnancy.

Second Trimester

Round ligament pain is a common cause of sharp or pulling pain in the lower abdomen during the second trimester. The round ligaments support the uterus and stretch as the uterus grows.

You may notice this discomfort when:

• Getting up quickly
• Turning over in bed
• Coughing or sneezing
• Laughing
• Making a sudden movement

Round ligament pain is usually brief and improves once the triggering movement stops. It can occur on one or both sides.

Third Trimester

As the uterus becomes larger and heavier, pressure on surrounding muscles, ligaments and organs can contribute to abdominal and pelvic discomfort.

Braxton Hicks contractions may also become more noticeable. These practice contractions are generally irregular and do not progressively become stronger or closer together. They may settle after changing position, resting or drinking fluids.

Pelvic girdle pain can also occur during pregnancy and may cause discomfort around the pelvis, lower back or hips, particularly when walking, climbing stairs or turning in bed.

Regular or increasingly painful contractions before 37 weeks, particularly when accompanied by pelvic pressure, vaginal bleeding or fluid leakage, require prompt assessment.

Some patterns of abdominal pain can occur with pregnancy complications. Seek prompt medical attention if you experience:

• Severe or persistent abdominal pain that does not improve with rest or a change in position
• Severe or one-sided lower abdominal or pelvic pain during early pregnancy
• Heavy vaginal bleeding or bleeding accompanied by significant pain
• Fever or chills with abdominal pain
• Regular contractions or increasing pelvic pressure before 37 weeks
• A sudden gush or continuous leakage of fluid from the vagina
• Reduced fetal movements later in pregnancy
• Severe headache, visual disturbances or sudden swelling with upper abdominal pain
• Sudden severe abdominal pain, particularly when accompanied by bleeding or feeling faint

The following conditions can cause abdominal pain during pregnancy and require medical assessment.

Not every case of abdominal pain indicates a serious problem, but severe or unusual pain should be assessed rather than managed at home.

Do not self-medicate abdominal pain during pregnancy. The appropriate treatment depends on the cause of the pain and the stage of pregnancy.

Non-steroidal anti-inflammatory drugs (NSAIDs), including ibuprofen and diclofenac, are not routinely recommended during pregnancy and should only be used when specifically advised by a healthcare professional. Their use later in pregnancy can cause important risks to the fetus, including effects on the kidneys and amniotic fluid and premature closure of the ductus arteriosus.

Aspirin should not be used as a painkiller during pregnancy unless your doctor specifically recommends it. Low-dose aspirin may be prescribed for certain pregnancy-related indications, but this is different from taking aspirin for pain relief.

Do not take antispasmodics, combination painkillers, herbal preparations or other medicines for abdominal pain without discussing them with your doctor or pharmacist.

If you are already taking a prescribed medicine, do not stop it suddenly without medical advice.

If your healthcare professional has confirmed that the discomfort is not related to a pregnancy complication, these measures may help:

• Rest and change position when discomfort occurs.
• Move slowly when standing up or changing position, particularly if you experience round ligament pain.
• Drink fluids regularly throughout the day.
• Try gentle walking or pregnancy-appropriate stretching if you feel comfortable.
• Eat smaller, more frequent meals if gas or bloating contributes to the discomfort.
• Include fibre-rich foods such as vegetables, fruit, whole grains and pulses to help prevent constipation.
• A warm, not hot, compress may help relieve muscle-related discomfort. Avoid high temperatures and prolonged application directly to the skin.

If you are considering a cramp-relief product during pregnancy, speak with your doctor or pharmacist first. Products intended for menstrual cramps may not be suitable during pregnancy. You can explore the cramp relief products available through Apollo Pharmacy, but check the individual product information and its suitability for pregnancy before use.

Do not take painkillers or other medicines for abdominal pain without medical advice. If you experience a suspected side effect or unexpected reaction after taking a medicine, inform your healthcare professional and report it through the appropriate adverse drug reaction reporting system.

Mild, occasional lower abdominal discomfort is common during pregnancy and can result from uterine growth, digestive changes, round ligament pain or other normal pregnancy-related changes. The pattern of discomfort can also change as pregnancy progresses.

Severe, persistent or one-sided pain, heavy bleeding, fever, regular contractions, fluid leakage or reduced fetal movements require prompt medical assessment. When in doubt, contact your doctor or maternity care team rather than trying to determine the cause of significant abdominal pain yourself.