Hip & SI Joint Pain During Pregnancy

Your Pelvis Is the Bridge

Between Your Spine and Your Legs

The pelvis connects the trunk to the lower body. Every time you walk, stand, sit, climb stairs, shift your weight, roll over, get out of the car, bend, lift, or balance on one leg, your spine, sacrum, SI joints, pelvis, hips, and legs have to coordinate together.

Pregnancy changes the physical environment in which all of those movements occur. That is why hip or SI discomfort is rarely just about one isolated spot.

What Are the SI Joints?

Small Movement—Important Function

The sacroiliac—or SI—joints are located where the sacrum connects with the right and left sides of the pelvis. They are designed for relatively small amounts of movement compared with joints such as the hip.

But they play an important role in transferring load between the spine and legs, adapting during walking, managing weight shifts, and working with the pelvis and hips during movement.

During pregnancy, changing load, posture, movement strategies, connective-tissue changes, and a growing abdomen can influence how the pelvic region experiences movement. The goal is not to make the SI joints move excessively. It is to support appropriate mobility and coordinated function across the entire pelvic region.

How Your Pelvis Transfers Movement

The pelvis connects the spine with the lower body. Walking, standing, turning, and changing positions require these regions to coordinate together.

What You May Be Feeling

Women may describe:

The location matters. But equally important is: What movement brings the discomfort on?

Why Pregnancy Changes Hip & Pelvic Mechanics

Your Body Has to Transfer Weight Differently

As pregnancy progresses, baby grows, body mass distribution changes, the abdomen moves forward, and the center of gravity shifts. Abdominal mechanics change, pelvic load increases, walking patterns may change, and sleep positions become more limited. Connective tissues become more adaptable, and daily movement requires continual adjustment.

Your body responds by finding new ways to keep you balanced and moving. That adaptation is normal. But sometimes one region begins doing more of the work.

For example, the body may shift more weight toward one side, use one hip differently, change stride length, change pelvic rotation, use the lumbar spine differently, avoid movement through an uncomfortable region, or rely on another joint to compensate.

Over time, those movement strategies may become part of what you feel.

Pregnancy Is Not Making Your Pelvis "Unstable"

Pregnancy hormones influence connective tissues and help prepare the body for pregnancy and birth. You may have heard descriptions like "your pelvis is loose," "your hips are unstable," or "everything is out of alignment."

The pelvis remains a strong structure. What changes is the physical environment and the demands placed on it.

The more useful question is: How well is your body adapting to those changing demands?

Pregnancy Changes Weight Transfer

Your body is not losing alignment—it is continually adapting to a changing physical environment.

The Nervous System Has to Manage Weight Transfer

Walking Is a Brain-Body Process

Walking can feel automatic, but it requires constant neurological coordination. With every step, the nervous system receives information about joint position, pressure, balance, muscle length, weight distribution, head position, movement, and ground contact.

The brain uses that information to coordinate the next movement. Pregnancy changes the body generating those signals. Your body proportions change. Your center of gravity changes. Your stride may change. Your pelvis and hips may load differently.

The nervous system continually updates the movement strategy. This is why our prenatal approach looks beyond the painful area and considers the movement pattern behind it.

Proprioception & The Changing Pelvis

Knowing Where Your Body Is in Space

Proprioception gives the nervous system information about where your joints and body are positioned. When you step onto one leg, walk up stairs, roll in bed, or stand from sitting, proprioceptive information helps your nervous system coordinate the movement.

As pregnancy changes your body, the nervous system has to work with a continually changing physical frame. This does not mean pregnancy disrupts proprioception. It means the nervous system is continuously adapting movement to new demands.

Mobility Gives Your Body Options

Adaptation Works Better When Movement Is Available

Imagine one hip does not move as comfortably as the other. Your body still needs to walk, bend, stand, turn, balance, and climb stairs. So it finds another strategy. The pelvis may move differently. The lower back may contribute more. The opposite hip may carry more load. Your stride may change.

That is compensation. Compensation is not automatically harmful. It is one of the ways the nervous system keeps us moving. But when the same strategy becomes the only comfortable option, that pattern may contribute to increasing physical demand.

Our goal is to help give the body more movement options.

Hip Pain at Night

Why Does Sleeping Suddenly Hurt?

Side sleeping places sustained pressure through the hip and pelvis. As pregnancy progresses, women may also have fewer comfortable sleep positions available. Hip discomfort at night may be influenced by direct pressure through the lateral hip, pelvic positioning, leg position, mattress support, hip mobility, SI-region discomfort, or prolonged time on one side.

Helpful positioning may include:

• Pillow between the knees and thighs
• Belly support when helpful
• Full-length pregnancy pillow
• Changing sides when comfortable
• Avoiding letting the upper leg fall far across the body if that aggravates symptoms

The goal is to support the pelvis rather than force a perfectly straight sleeping position.

Walking & Weight Shifting

One Step Requires the Whole Pelvis

Walking repeatedly transfers body weight: Right → Left → Right → Left. Each step requires coordination between the hip, pelvis, SI region, spine, leg, foot, and balance system.

When one area moves differently or becomes uncomfortable, the body may change the way weight is transferred. Parents often notice asymmetry in children. Pregnant women can experience their own version of this: "I feel like I'm walking differently."

Sometimes they are. And during pregnancy, changing gait can simply be part of the body's adaptation. The question becomes whether that strategy remains comfortable and functional.

Hip Pain vs. SI Pain vs. Pelvic Girdle Pain

They Can Overlap

These terms are often used interchangeably, but they are not exactly the same.

The goal is not for the mother to diagnose herself. These categories simply help explain why different women describe pregnancy pelvic discomfort differently.

What We Look At

How Is Your Body Transferring Movement?

Dr. Liz may assess:

The goal is to understand: What movement strategy is your body using—and where might additional mobility or support be helpful?

How Prenatal Chiropractic Fits

Support the Pelvis Without Trying to Freeze It in Place

Pregnancy requires movement and adaptation. Our goal is not to put the pelvis into one permanent "correct position." Dr. Liz uses gentle, pregnancy-appropriate chiropractic care to evaluate and address identified restrictions in spinal and joint mobility.

Care may support pelvic mobility, sacral mobility, SI-region function, hip movement, lumbar mobility, comfortable weight transfer, postural adaptability, body awareness, movement options, and nervous system regulation.

The goal is: support mobility so the body has more options for adapting to pregnancy.

Webster Technique

A Pregnancy-Specific Approach to Pelvic & Sacral Function

Dr. Liz is certified in the Webster Technique. Webster Technique is a specific chiropractic analysis and adjustment used during pregnancy with a focus on sacral and pelvic biomechanics and associated soft-tissue tension.

This can fit naturally into care when pelvic and sacral function are relevant to the mother's presentation. The focus remains on maternal pelvic and sacral function.

"Is One Hip Out of Alignment?"

A More Useful Way to Think About It

Pregnant women are often told: "One hip is out." or "Your pelvis is out of alignment." That language can make the body sound fragile. The body is not a stack of bones that easily slips apart.

A more useful conversation is:

• Is one region moving differently?
• Is one side carrying more load?
• Is mobility reduced?
• Is one movement uncomfortable?
• Is compensation occurring elsewhere?

We want mothers to understand their bodies—not become afraid of them.

Simple Support Between Visits

Depending on your pregnancy and obstetric provider's guidance, consider:

• Change positions regularly
• Avoid prolonged standing when it aggravates symptoms
• Sit while getting dressed if balancing on one leg is uncomfortable
• Use support between the knees while side sleeping
• Keep frequently used items within comfortable reach
• Wear comfortable supportive footwear
• Break long periods of walking or standing into manageable periods
• Continue appropriate movement and physical activity if cleared
• Pay attention to repeated movements that consistently aggravate one side

If a movement clearly increases pain, do not force it simply because it is supposed to be "good for pregnancy." Your individual presentation matters.

When to Contact Your OB or Midwife

New or Severe Pain Deserves Appropriate Evaluation

Contact your prenatal healthcare provider when hip, pelvic, or back pain is severe, rapidly worsening, following a significant fall or injury, accompanied by vaginal bleeding, associated with fever, associated with contractions or concern for preterm labor, associated with urinary symptoms, accompanied by significant leg weakness or numbness, associated with calf swelling, redness, warmth, or significant one-sided leg symptoms, making it extremely difficult to walk or bear weight, or associated with another symptom that concerns you.

Related Concerns

The Pelvis Works as a System

Prenatal Chiropractic Connection

Support for a Body That Is Constantly Changing

The pelvis has to help transfer force between your growing upper body and your legs throughout pregnancy. Dr. Liz is certified in the Webster Technique and uses gentle prenatal chiropractic care tailored to your pregnancy stage, mobility, pelvic mechanics, movement, physical demands, current concerns, and individual goals.

Hip Pain Changing How You Move? Let's Look at the Whole Pelvis

Your pelvis and hips are doing more than carrying additional weight. They are helping your body balance, walk, transfer force, change positions, and adapt as your pregnancy progresses. If one side begins feeling like it is doing all the work, we can look more closely at how your spine, pelvis, SI joints, and hips are moving together.