Why Mobility and Balance Often Decline in Pregnancy

Mobility and balance often decline during pregnancy due to a combination of physical, hormonal, and biomechanical changes that occur as the body adapts to support the growing foetus. Here are the main reasons why:

1. Weight Gain and Shift in Centre of Gravity

As the baby grows, the uterus expands, and the mother gains weight—mostly in the front.

This shifts the centre of gravity forward, making it harder to maintain balance. The body often compensates by leaning backward (called lordosis), which can strain the lower back and affect posture.

2. Hormonal Changes

Pregnancy hormones, especially relaxin, increase joint and ligament flexibility to prepare for childbirth.

While helpful for delivery, this joint laxity can make movements feel less stable and increase the risk of falls.

3. Changes in Muscle Function and Strength

Core muscles, especially the abdominals, stretch to accommodate the growing uterus, reducing core strength.

Weakness in these muscles affects posture, balance, and the ability to stabilise the spine during movement.

4. Fluid Retention and Swelling

Swelling in the legs and feet (oedema) can alter sensation and proprioception (body awareness), making walking less stable.

It can also lead to numbness or tingling, affecting balance and coordination.

5. Fatigue and Sleep Disturbances

Pregnancy often leads to reduced energy levels and poor sleep quality, which can slow reflexes and coordination. Tiredness can also reduce attentiveness, increasing the chance of trips or stumbles.

6. Vestibular System Sensitivity

Some pregnant women experience dizziness or vertigo, especially in the first trimester.

This is often due to changes in blood pressure or fluid balance affecting the inner ear, which helps regulate balance.

Pregnancy challenges the body in multiple ways, including structural shifts, hormonal effects, and muscular changes.

Together, these factors contribute to a natural decline in balance and mobility, particularly in the later trimesters.

If you’re experiencing any balance issues, dizziness or feel unsteady with movement please do book in and see our women’s health physio team.

We look forwards to assessing, treating and helping you through your pregnancy journey with our pre & postnatal physiotherapy services.

PhysioMatters Team – Danielle, Xan and Claire