osteoporosis in pregnancy

Overview

Osteoporosis is a condition that makes bones weak and more likely to break. When it happens during pregnancy, it is called pregnancy-associated osteoporosis. It is rare and usually affects the spine or hip. The good news is that most women improve after pregnancy with the right care.

No. Osteoporosis during pregnancy is very rare. You are more likely to have back pain from the weight of the baby and changes in posture than from osteoporosis.

It can affect any pregnant woman, but it is more common in first-time mothers, women who have a family history of osteoporosis, and women who already had low bone density before pregnancy.

Symptoms

Common symptoms

• Sudden or gradual back pain, especially in the middle or lower back
• Hip pain or pain in the tailbone area
• Difficulty standing or walking without pain
• A feeling of reduced height or a curved spine if a vertebra (back bone) has broken

Causes

Main causes

• The exact cause is not fully understood, but pregnancy increases the need for calcium, changes hormone levels, and puts extra weight on the spine and hips.
• Some women lose bone more quickly than normal during pregnancy, especially if their calcium intake is low or they have been on medicines that weaken bones.
• Osteoporosis may also be noticed for the first time during pregnancy, even if it started before conception.

Risk factors

• First pregnancy
• Low body weight or a history of eating disorders
• Vitamin D deficiency or a diet low in calcium
• Family history of osteoporosis
• Smoking or heavy alcohol use before pregnancy
• Certain medical conditions or medicines that affect bone health (for example, prolonged use of steroids)

When to see a doctor

See a doctor urgently if:

• Call your local emergency number if you have sudden severe back pain with leg weakness, numbness, or loss of bladder or bowel control.
• See a doctor the same day if you cannot put any weight on your leg or if pain is getting worse quickly.

Book a routine appointment if:

• Tell your midwife or obstetrician if you have ongoing back or hip pain during pregnancy, especially if it is only on one side or it wakes you at night.
• Ask for a referral to a bone specialist (rheumatologist or orthopaedic surgeon) if your doctor is concerned about your bones.

Diagnosis

Your doctor will ask about your symptoms, your medical history, and any risk factors. They will examine your back and hips to see which movements cause pain. If they suspect osteoporosis, they will consider imaging tests to check your bones.

Tests that may be done

• Magnetic resonance imaging (MRI) to look at the spine and check for fractures without using X-rays
• Dual-energy X-ray absorptiometry (DXA or DEXA) is a type of bone density scan, but it is usually delayed until after delivery unless there is a very strong reason.
• Blood tests to check calcium, vitamin D, and thyroid or kidney function

What to expect at your appointment

After pregnancy, your doctor may confirm the diagnosis with a bone density scan. During pregnancy, they will try to keep imaging tests to a minimum to protect the baby, but an MRI is safe and can be very helpful if you have severe back pain.

Treatment

Treatment focuses on managing pain, protecting your bones from further breaks, and helping your spine and hips heal. Most women do not need surgery. When osteoporosis is found during pregnancy, the plan is usually gentle and safe for both you and your baby.

Self-care at home

• Rest on a firm but comfortable mattress and lie on your side with a pillow between your knees.
• Use a warm (not hot) heat pack on sore muscles, or a cold pack wrapped in a cloth for short periods.
• Maintain good posture when sitting and standing; use a small pillow behind your lower back.
• Ask for help with heavy tasks and avoid lifting anything heavier than a small bag.
• Do gentle movements, like walking or swimming, if they do not increase your pain.

Medical treatments

Your doctor may recommend calcium and vitamin D supplements in a pregnancy-safe form. For pain relief during pregnancy, only certain types of painkillers are considered safe, so always ask your pharmacist or obstetrician before taking anything. In very rare circumstances, if a fracture is unstable or putting pressure on the spinal cord, a procedure called kyphoplasty or vertebroplasty (injecting bone cement into a broken back bone) may be discussed. After pregnancy, some women may be offered bone-strengthening medications, but these are generally avoided during pregnancy and breastfeeding, and the decision is made together with your specialist.

When is surgery considered?

Surgery is usually not needed. It may be considered if you have a significant hip fracture that requires stabilisation, or if a broken vertebra is pressing on your spinal cord and causing weakness or numbness. Your orthopaedic surgeon will explain exactly what is involved and the timing, often until after your baby is born.

Living with this condition

Recovery takes time and patience. Listen to your body — if something hurts, stop and rest. Plan your day so you have time to sit or lie down. Use supportive pillows and consider a maternity support belt, especially in the last trimester.

Lifestyle tips

• Stop smoking and avoid alcohol, as these worsen bone loss.
• Aim for good sleep, with comfortable positioning and extra pillows.
• Try stress-reducing activities like slow breathing, mindfulness, or gentle stretching as allowed by your doctor.
• Accept offers of help with housework, childcare, and shopping.

Diet and exercise

Eat a balanced diet rich in calcium and vitamin D. Good sources of calcium include dairy products, fortified plant milks, leafy green vegetables, and sesame seeds. Sunlight helps your skin make vitamin D, but in the UK and many other places you may still need a supplement, especially in winter. Gentle weight-bearing exercises such as walking and low-impact aerobics (after you recover) can help rebuild bone strength. Always check with your physiotherapist before starting new exercises.

Mental health and emotional wellbeing

Living with pain and the fear of breaking a bone can be worrying and stressful. It is completely normal to feel anxious or low. Talk to your midwife, doctor, or a counsellor about how you are feeling. If you have thoughts of harming yourself or your baby, please reach out to your local crisis team or call your local emergency number immediately.

Prevention

Not all cases can be prevented, but building strong bones before pregnancy is the best defence. If you are planning a pregnancy and have risk factors for osteoporosis, talk to your doctor about your bone health first.

Complications

If left untreated

• A broken bone (fracture) in the spine or hip, which can cause severe pain and disability
• Loss of height and a stooped posture over time
• Chronic pain that lasts long after pregnancy
• In rare cases, nerve damage in the legs if a spinal fracture presses on nerves

Long-term outlook

With the right care, most women with pregnancy-associated osteoporosis recover well. Pain usually improves within weeks or months, and bone density often returns to normal levels by itself after pregnancy and breastfeeding. You may need follow-up bone scans, but you can expect to lead an active, full life.

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