Pregnancy Shoulder Pain: What Left and Right Side Pain Means

Pregnancy shoulder pain is usually postural or hormonal. A pregnancy hormone called relaxin loosens your joints, and your growing belly pulls your posture forward. Both strain the shoulders. But sudden, sharp pain at the shoulder tip, especially on the right, can signal ectopic pregnancy, HELLP syndrome, or biliary colic. That pain needs same-day care.

At Total Orthopedics & Sports Medicine, we find the cause and ease the shoulder pain with care that is safe for you and your baby. We watch your symptoms as your pregnancy progresses, especially in the second and third trimesters. We accept a wide range of insurance plans and offer self-pay options. Call us at 855-321-6784 to book your visit.

What Are the Most Common Causes of Shoulder Pain During Pregnancy?

The most common causes of shoulder pain during pregnancy are postural: poor sleeping position, weight gain, weak core muscles, and pelvic alignment changes. Less often, however, shoulder pain is referred from a serious condition such as ectopic pregnancy or HELLP syndrome.

Muscular pain builds slowly and eases with rest. In contrast, referred pain is sudden and sharp, and it needs same-day care. Here is how each cause leads to shoulder pain:

1. Poor Sleeping Position

Poor sleeping positions during pregnancy can strain the shoulders when the body is unsupported. For example, lying with your arm tucked under your body or head, stretched overhead, or without proper pillows can put pressure on the shoulder joint and rotator cuff tendons.

In turn, this pressure irritates connective tissue, causing stiffness, muscle tension, or severe shoulder pain.

2. Increased Weight in Second and Third Trimesters

As pregnancy progresses, weight gain places additional stress on the shoulder joints and upper body. This extra load can lead to tight muscles, poor posture, and tightness around the shoulder blades. Over time, the strain on weak upper back muscles can worsen, which contributes to severe pain and stiffness in the shoulder region.

Moreover, according to the NHS, most pregnant women gain between 22 and 28 lb (10 to 12.5 kg) during pregnancy. By the third trimester, your upper back muscles carry the equivalent of a full backpack. That is why postural shoulder pain peaks in the final months.

Here’s how you can manage weight and reduce shoulder strain during pregnancy:

• Eat a balanced, nutritious diet to support healthy weight gain.
• Engage in low-impact exercises, like walking, swimming, or prenatal yoga.
• Maintain good posture throughout the day and while sleeping.
• Stay hydrated to support joint health and elasticity.
• Use pillows and a supportive chair to support good posture.

3. Weak Core Muscles

When your core muscles (transverse abdominis, obliques, and hip flexors) are weak during pregnancy, they cannot properly stabilize your torso. Consequently, this lack of support can increase muscle strain in the upper back, shoulder joints, and shoulder muscles.

To reduce this strain, you can support your core with gentle stretches and strengthening exercises.

4. Pelvic Alignment Changes

Pelvic floor dysfunction can cause shoulder pain during pregnancy because weak pelvic muscles reduce stability in the lower body. As a result, the pelvis tilts forward, which changes spinal alignment.

Over time, this misalignment can overload the shoulder joints and muscles, leading to musculoskeletal pain and tightness.

Fortunately, some safe pelvic-strengthening exercises during pregnancy may help relieve discomfort:

• Kegel exercises: Tighten and relax pelvic muscles for a few seconds, then release.
• Bridge pose: Lie on your back with knees bent and lift your hips gently.
• Pelvic tilts: Perform on hands and knees, arching and rounding the lower back slowly.
• Squats: Do gentle, supported squats to activate core and pelvic muscles.

Important Note: Check with your OB before starting any exercise.

5. Ectopic Pregnancy

Ectopic (tubal) pregnancy is a serious complication that can cause shoulder pain during pregnancy. Here, the shoulder pain is referred pain. Blood from internal bleeding irritates the diaphragm, and the phrenic nerve carries that signal to the shoulder tip.

According to NCBI, ectopic pregnancy affects about 1% to 2% of pregnancies in the United States and accounts for an estimated 2.7% of pregnancy-related deaths. In other words, it is rare, but it is the most dangerous cause of shoulder pain on this page.

Important Note: If sudden shoulder-tip pain appears in early pregnancy with belly pain, bleeding, or dizziness, call 911 or go to the emergency room immediately.

6. HELLP Syndrome

HELLP syndrome is a potentially life-threatening pregnancy complication that can cause upper back pain, abdominal discomfort, severe headaches, and shoulder pain. Typically, this sharp pain is referred pain from liver inflammation.

According to NIH, HELLP syndrome affects 0.5% to 0.9% of pregnancies, with about 70% of cases occurring in the third trimester. As a result, new, sharp right shoulder pain in your final trimester, especially with a headache or nausea, should never be dismissed as postural pain. Seek medical attention immediately.

What Causes Left Shoulder Pain During Pregnancy?

Left shoulder pain during pregnancy is most often musculoskeletal and develops gradually in the second and third trimesters. As your uterus grows, your center of gravity shifts forward. To compensate, the muscles of the upper back and shoulder work harder to hold you upright.

Over time, this constant effort strains the shoulder joint, rotator cuff tendons, and upper trapezius. Moreover, the pregnancy hormone relaxin loosens the ligaments that stabilize the shoulder, so the joint is more vulnerable to strain.

Here are the most common reasons the left side is affected:

• Left-side sleeping: Sleeping on your left side improves blood flow to your baby, so it is the standard advice in later pregnancy. However, it places your full body weight on the left shoulder for hours each night. Without a supportive pillow, the joint and rotator cuff tendons are compressed.
• One-sided carrying: Carrying a bag, groceries, or an older child on the same side overloads the left shoulder and upper back muscles.
• Forward posture: A growing belly rounds the shoulders forward, which tightens the chest and overstretches the upper back muscles.

This type of pain typically feels like a dull ache, stiffness, or tightness around the shoulder blade. It usually improves with rest, supportive pillows, posture correction, and gentle stretching.

What Causes Right Shoulder Pain During Pregnancy?

Right shoulder pain in pregnancy can occur due to referred pain from internal organs, muscle strain, or postural changes. Referred pain happens because nerves from the liver, gallbladder, and bile ducts share pathways with the right shoulder. When these organs are irritated or inflamed, the shared nerves carry sharp, aching, or stabbing pain to the right shoulder.

Because the liver and gallbladder both sit beneath the right ribs, the right shoulder is where two serious pregnancy complications tend to appear. HELLP syndrome inflames the liver, while gallstones irritate the gallbladder. In both cases, the swollen organ irritates the diaphragm. The phrenic nerve then carries that pain to the right shoulder tip. Seek same-day medical care if right shoulder pain occurs with any of the following unusual symptoms:

• Sudden, sharp pain at the shoulder tip: Especially if it appears without any lifting, sleeping, or postural trigger.
• Pain after fatty meals: Cramping in the right shoulder or under the right ribs within an hour of eating is a classic sign of biliary colic.
• Severe headache, nausea, or upper abdominal pain: In the third trimester, these point to HELLP syndrome.

Shoulder Pain in Pregnancy: Causes at a Glance

Left or right, the rule is the same. Slow, achy pain that eases with rest is usually muscular, while sudden, sharp pain at the shoulder tip is not. The table below puts all eight causes side by side. Match your symptoms to see whether you need a routine visit or same-day care.

Cause	Side / Trimester	Symptoms & Urgency
Pelvic floor dysfunction	Either side, 2nd–3rd trimester	Dull ache that builds through the day. Urgent care: No
Poor sleeping position	Side you sleep on, any trimester	Stiff on waking, eases with movement. Urgent care: No
Increased weight	Both sides, 2nd–3rd trimester	Tightness around the shoulder blades. Urgent care: No
Weak core muscles	Both sides, any trimester	Upper-back strain with standing or lifting. Urgent care: No
Ectopic pregnancy	Either shoulder tip, 1st trimester	Sudden sharp pain with belly pain, bleeding, or dizziness. Urgent care: Emergency — call 911
HELLP syndrome	Right side, 3rd trimester	Sharp pain with headache, nausea, and right-rib pain. Urgent care: Emergency — call 911
Biliary colic	Right side, any trimester	Cramping after fatty meals. Urgent care: Same day
Acid reflux	Either side, 2nd–3rd trimester	Burning, worse after eating or lying down. Urgent care: No

Does Shoulder Pain Change by Trimester?

Yes, shoulder pain during pregnancy changes by trimester. It is rare early, begins in the middle months as posture and hormones shift, and peaks in the final months.

• First trimester (weeks 1–12): Muscular shoulder pain is uncommon this early. Instead, pain at the tip of the shoulder in the first trimester may indicate ectopic pregnancy, caused by internal bleeding irritating the diaphragm.
• Second trimester (weeks 13–27): Hormonal fluctuations, mainly relaxin, loosen the joints and your belly begins to pull your posture forward. As a result, a dull ache in the upper back and shoulders often appears during these months.
• Third trimester (weeks 28–40): Weight gain, side-sleeping, and forward posture make this the most common time for muscular shoulder pain. Most nights, the pain is worst on the side you sleep on.

How Does Biliary Colic Cause Shoulder Pain During Pregnancy?

Biliary colic causes shoulder pain during pregnancy through referred pain. When gallstones block your bile ducts, the gallbladder swells and irritates the diaphragm. The diaphragm shares a nerve pathway, the phrenic nerve, with your right shoulder. As a result, you feel sharp pain at the tip of the right shoulder even though the problem is in your gallbladder.

Pregnancy raises the risk because higher estrogen levels slow gallbladder emptying, which allows stones to form. This is why gallstone pain often appears for the first time in the second or third trimester.

The pain typically starts within an hour of eating, especially after fatty meals such as:

• Fried foods (like fried chicken or French fries)
• Fatty meats (such as bacon, sausage, or beef)
• Creamy or cheesy dishes
• Pastries and baked goods high in butter or cream

Untreated biliary colic can progress to gallbladder inflammation, pancreatitis, or infection, all dangerous for you and your baby. Seek emergency medical care if shoulder pain follows a meal, and go to the ER if it comes with fever or vomiting. Once your OB or GI doctor has ruled out a gallbladder cause, our shoulder specialists can check for a joint or muscle problem. Call 855-321-6784 to book a visit.

Is Acid Reflux a Possible Cause of Shoulder Discomfort During Pregnancy?

Yes, acid reflux can cause shoulder discomfort during pregnancy, usually felt between the shoulder blades or in the upper back. When stomach acid flows back into the esophagus, it irritates nerves that share pathways with the upper back and shoulders. The result is a burning ache between the shoulder blades that starts in the stomach, not the shoulder.

Reflux is common in pregnancy for a few reasons:

• Pressure from the growing uterus pushes on the stomach.
• Pregnancy hormones relax the valve between the stomach and esophagus.
• Large or fatty meals sit in the stomach longer.
• Lying down soon after eating lets acid flow back up.
• Spicy or acidic foods, chocolate, and caffeine irritate the esophagus.

Reflux-related shoulder pain burns rather than aches, worsens after meals or when lying flat, and usually comes with heartburn. Smaller meals and staying upright after eating often ease it. However, if the pain is sharp, one-sided, or unrelated to meals, reflux is unlikely, and the shoulder itself should be examined.

How Is Shoulder Pain During Pregnancy Diagnosed?

At Total Orthopedics & Sports Medicine, we diagnose pregnancy shoulder pain with a hands-on exam and, when needed, on-site ultrasound imaging. Ultrasound uses sound waves rather than radiation. As a result, it is safe during pregnancy and shows the rotator cuff tendons and muscles in real time.

Muscular pain typically responds to posture correction and exercise. In contrast, referred pain from another organ needs a specific treatment from a different doctor entirely. Dr. Charles Ruotolo is fellowship-trained in shoulder surgery and has published research on rotator cuff injuries. That experience helps separate a strained shoulder from referred pain early in your care.

If the cause is muscular, we build a plan around pregnancy-safe options such as posture correction, targeted exercise, and supportive bracing. Call 855-321-6784 to schedule an assessment.

Will Shoulder Pain Go Away After Delivery?

In most cases, yes. Shoulder pain from posture, weight gain, or sleeping position usually eases within a few weeks of delivery. However, relaxin can stay elevated for several months, especially while breastfeeding, so the joint remains easier to strain. Moreover, nursing and lifting a growing baby keep the shoulders rounded forward. That is why some women find the pain shifts sides or returns postpartum.

When Should You Contact Our Shoulder Specialists?

Contact our shoulder specialists when pregnancy shoulder pain lasts more than a few days, disturbs your sleep, or limits daily tasks like lifting or dressing. Walk in to Total Ortho Express the same day. No appointment or referral is needed, and care is pregnancy-safe.

You should see us if:

• Pain lasts longer than a few days despite rest, pillows, and posture changes.
• Sleep is disrupted because lying on either side hurts.
• Daily tasks are harder, such as lifting, reaching overhead, or carrying an older child.
• Stiffness is spreading into the neck, upper back, or between the shoulder blades.

See a Shoulder Specialist at Total Orthopedics & Sports Medicine Today

Shoulder pain during pregnancy does not have to last until delivery. At Total Orthopedics & Sports Medicine, our fellowship-trained shoulder specialists find the exact cause of your pain. Then, we create a treatment plan that is safe for you and your baby.

Moreover, we offer diagnostics, imaging, and treatment under one roof. This means fewer delays and faster relief. You can also call 855-321-6784 to schedule a visit at any of our locations across New York and New Jersey. We accept a wide range of insurance plans and offer self-pay options.

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