Right-Sided Rib Pain: Identifying Gallbladder Stress During Your Third Trimester

Experiencing right side pain under rib during your third trimester can be uncomfortable—and sometimes concerning. While many aches and pains are a normal part of pregnancy, persistent or severe pain on the right side deserves careful attention. One possible cause is gallbladder stress, including inflammation known as acute cholecystitis.

Understanding what is normal, what may signal a problem, and when to seek medical care can help you feel more confident and prepared.

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Why Right Side Pain Under Rib Happens in Late Pregnancy

During the third trimester, your body is undergoing major changes:

• Your uterus expands upward, pushing against abdominal organs.
• Hormones like progesterone relax smooth muscles, including those in the digestive system.
• Digestion slows down.
• The gallbladder empties less efficiently.

All of these factors can contribute to right side pain under rib, especially if the gallbladder is involved.

The gallbladder sits just under the liver on the upper right side of your abdomen, beneath your rib cage. Its job is to store bile, which helps digest fats. During pregnancy, bile flow may slow, increasing the risk of gallstones or gallbladder inflammation.

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Common Causes of Right Side Pain Under Rib in the Third Trimester

Not all right-sided pain is serious. Here are some possible explanations:

1. Baby's Position

As your baby grows, they may stretch or kick into your ribs. This can cause:

• Sharp or aching pain under the right rib
• Discomfort that changes with movement
• Pain that improves when you shift positions

This type of pain is usually temporary and linked to movement.

2. Muscle Strain

Your expanding abdomen shifts your posture and strains core muscles. You may notice:

• Tenderness to touch
• Pain that worsens with movement or twisting
• Relief with rest

3. Indigestion or Heartburn

Pregnancy commonly causes digestive symptoms such as:

• Bloating
• Gas
• Burning sensation in the chest
• Discomfort after eating

These symptoms may overlap with mild right side pain under rib discomfort.

4. Gallbladder Problems

Gallbladder issues are more common during pregnancy due to hormonal changes. These may include:

• Gallstones
• Biliary colic (temporary blockage of bile flow)
• Acute cholecystitis (inflammation of the gallbladder)

Gallbladder-related pain tends to have specific features, which we'll explore below.

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How Gallbladder Stress Feels

Gallbladder pain often feels different from muscle or baby-related discomfort.

Typical signs include:

• Steady, severe pain in the upper right abdomen
• Pain that may spread to the back or right shoulder
• Pain that begins after eating, especially fatty meals
• Nausea or vomiting
• Fever (in more serious cases)

The pain may last from 30 minutes to several hours. Unlike a baby's kick, gallbladder pain does not usually improve with repositioning.

If you're experiencing these symptoms and want to better understand whether they could be related to gallbladder inflammation, Ubie's free AI-powered Acute Cholecystitis symptom checker can help you assess your condition before speaking with a healthcare professional.

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Why Pregnancy Increases Gallbladder Risk

Pregnancy creates several conditions that make gallbladder problems more likely:

• Higher estrogen levels increase cholesterol in bile.
• Progesterone slows gallbladder emptying.
• Slower digestion allows bile to sit longer, increasing stone formation.
• Weight changes may contribute to gallstone development.

According to medical research published in obstetric and gastroenterology literature, gallstones develop in a notable percentage of pregnant women, though not all cause symptoms. When symptoms do appear, they often occur in the third trimester.

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When Right Side Pain Under Rib May Be Serious

While many cases are mild, certain symptoms require prompt medical attention.

Call your doctor or seek urgent care if you experience:

• Severe, constant pain lasting more than a few hours
• Fever or chills
• Yellowing of the skin or eyes (jaundice)
• Persistent vomiting
• Inability to keep fluids down
• Pain with a rigid or very tender abdomen

These could signal:

• Acute cholecystitis
• Bile duct blockage
• Infection
• Pancreatitis
• A pregnancy-related condition such as HELLP syndrome (a serious liver complication)

Do not ignore severe symptoms. Even during pregnancy, evaluation is safe and necessary when serious conditions are possible.

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How Doctors Diagnose Gallbladder Issues in Pregnancy

If you report right side pain under rib discomfort, your doctor may:

• Take a detailed history of your symptoms
• Perform a physical exam
• Order blood tests to check liver function and infection markers
• Recommend an ultrasound

Ultrasound is safe during pregnancy and is the preferred imaging method for gallbladder problems. It can detect gallstones, inflammation, or fluid buildup.

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Treatment Options During the Third Trimester

Treatment depends on severity.

Mild Gallbladder Pain (Biliary Colic)

Your doctor may recommend:

• Eating smaller, low-fat meals
• Avoiding fried or greasy foods
• Staying hydrated
• Pain management options safe for pregnancy

Many women can manage symptoms conservatively until after delivery.

Acute Cholecystitis

If inflammation is confirmed, treatment may include:

• Hospital observation
• IV fluids
• Antibiotics (if infection is suspected)
• Pain control

In some cases, surgery may be necessary—even during pregnancy. Laparoscopic gallbladder removal can be performed safely during pregnancy if the condition is severe or recurrent. Your obstetrician and surgical team will carefully weigh the risks and benefits.

While surgery sounds alarming, untreated infection or obstruction can be more dangerous than the procedure itself.

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Tips to Reduce Gallbladder Stress

If you are experiencing mild right side pain under rib discomfort and your doctor has ruled out urgent causes, consider these preventive steps:

• Eat smaller meals throughout the day.
• Choose lean proteins and low-fat foods.
• Limit fried and processed foods.
• Stay well hydrated.
• Avoid long periods without eating.
• Maintain gentle activity, like walking, if approved by your provider.

These steps support healthy digestion and may reduce gallbladder strain.

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How to Tell the Difference: Baby or Gallbladder?

Here is a quick comparison:

Baby Movement	Gallbladder Pain
Comes and goes	Often steady and persistent
Changes with position	Usually does not improve with repositioning
Feels like pressure or kicks	Feels deep, aching, or sharp
No fever	May include fever or nausea
Short-lived	Can last hours

If you are unsure, it is always appropriate to call your provider.

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The Bottom Line

Experiencing right side pain under rib during your third trimester is common—but it should not be ignored if it is severe, persistent, or associated with other symptoms.

In many cases, the cause is harmless, such as baby positioning or muscle strain. However, gallbladder stress and inflammation are real possibilities during late pregnancy due to hormonal and digestive changes.

Pay attention to:

• Duration of pain
• Severity
• Associated symptoms like fever, nausea, or jaundice
• Whether it follows meals

If you're concerned about your symptoms, try using Ubie's free Acute Cholecystitis symptom checker to gain clarity about what you're experiencing and whether you should seek immediate medical attention.

Most importantly, speak to a doctor about any pain that is severe, worsening, or accompanied by concerning symptoms. Conditions like acute cholecystitis, infection, or liver complications can become serious if untreated—but when addressed early, they are very manageable.

Pregnancy brings many changes, and not every ache signals danger. Still, listening to your body and seeking medical advice when something feels off is always the right decision—for both you and your baby.