Pregnancy week 28: back pain and leg cramps

Pregnancy week 28 is a common point for back discomfort and painful leg cramps. The uterus has risen well above the pelvis, posture has changed, and the ligaments supporting the joints are softer. Discomfort in the lower back, hips or calves is therefore common, although it should still be assessed when it is severe, persistent or unlike your usual sensations.

Muscle strain, pelvic girdle pain and ordinary fatigue can all cause an aching back. Leg cramps may follow prolonged standing, a busy day, a change in position or simply an overused calf muscle. Not every cramp has an identifiable cause, and a nutrient deficiency should not be assumed without advice from a maternity clinician.

Some pain can be managed safely at home, but a few symptoms need urgent assessment. These include one-sided leg swelling, chest pain or sudden breathlessness, fever with urinary symptoms, severe headache or visual changes, vaginal bleeding, leaking fluid, and regular painful contractions. Prompt care protects both the pregnant person and the baby.

Australian readers can turn to their GP, obstetrician, midwife or maternity hospital for advice. Public maternity care is generally available through the public system, while Medicare may also subsidise eligible physiotherapy or imaging. A national helpline can help decide whether symptoms are suitable for routine review, immediate care or an emergency assessment.

What changes by the start of the third trimester

At the start of the third trimester, the growing uterus shifts the centre of gravity forward. Standing with the lower back rounded, reaching, lifting or twisting can then load muscles that have been working harder for months. Prolonged sitting and a soft or unsupported chair may add to the problem, particularly for people who work at a desk or spend time driving around Australia.

Back pain, pelvic pain and sciatica are not interchangeable. A broad ache across the lower back often relates to posture or muscular strain. Pain near the front or back of the pelvis, especially when turning in bed or walking on one leg, may be pelvic girdle pain. Shooting pain, tingling or numbness down a leg needs individual assessment rather than a generic back-pain routine.

Distinguishing common aches from warning signs

Common symptoms usually develop gradually and remain mild enough for daily life. Braxton Hicks can cause brief abdominal tightening that settles, whereas pelvic discomfort may worsen with asymmetric movement. A cramp typically causes a sudden knot in the calf or foot and then relaxes. Restless legs feel different: the main sensation is an urge to move rather than a painful muscle contraction.

Deep pain in the side or back with fever, chills, vomiting or painful urination can indicate a kidney infection. Marked swelling, redness or warmth in only one leg may point to a blood clot and requires same-day medical assessment. Sudden chest pain, coughing blood or shortness of breath should trigger an emergency call because it can be a sign of a pulmonary embolism.

Also seek urgent maternity advice for heavy or bright-red vaginal bleeding, fluid loss, blood-stained discharge, regular painful contractions, or severe headache, visual disturbance, upper abdominal pain and sudden swelling. Back pain accompanied by loss of bladder or bowel control, numbness around the saddle area, or leg weakness can signal nerve compression or another serious problem.

Everyday adjustments that reduce back strain

Changing position frequently matters more than finding one perfect posture. When sitting, keep both feet supported and the back upright; when standing, move the feet and rest one foot on a low step if needed. At work, raise the screen, support the lower back and take short walking breaks. Lifting close to the body is safer than carrying a heavy load away from it.

A warm, not very hot, heat pack can relax sore muscles; wrap it and use it for about 15 to 20 minutes at a time, checking the skin. Side sleeping with the knees bent, a pillow between the knees and another under the belly often reduces strain. Comfortable, flat shoes with good support may also ease both back and calf muscles.

Gentle movement and safe stretching

Regular low-impact movement usually helps more than prolonged bed rest. Walking, stationary cycling, swimming or pregnancy-specific yoga can support circulation, sleep and pelvic mobility. Keep the effort conversational, avoid movements that cause pain, and stop if a cramp, pelvic pressure, dizziness or increasing pain occurs. A pelvic health physiotherapist can teach posture, walking and techniques for getting in and out of a car without aggravating the pelvis.

Simple calf stretches may help cramps: straighten the affected leg, flex the ankle and draw the toes towards the shin, then hold gently without bouncing. For general calf tightness, stand facing support, step one leg behind and keep both heels down. Pounding a tight muscle or forcing a stretch can increase the pain, and any new numbness or weakness should be reported rather than pushed through.

Handling painful leg cramps at night

Camping legs at night can disturb sleep even when the day has been quiet. Warmth, a few minutes of ankle movement, calf massage and gentle stretching are reasonable first steps. Staying in one position for too long, especially with pointed toes, may trigger another cramp, so change position and keep the feet relaxed under the covers.

Hydration should be steady through the day rather than achieved with one large jug at night. Include regular meals with calcium- and magnesium-rich foods such as dairy, leafy greens, beans and nuts. Vitamin or mineral supplements are not automatically needed for cramps; magnesium in particular can cause diarrhoea and may not be suitable for every medical situation, so ask a GP or midwife before starting one.

Medicines deserve a pregnancy-specific review. Paracetamol is generally considered an option for suitable pain when taken as directed, but check the dose with your clinician and avoid combining products that also contain paracetamol. Ibuprofen and naproxen are generally avoided from 20 weeks onwards unless a clinician specifically advises them, because they can affect amniotic fluid and foetal kidney function. A pharmacist can check a product while a clinician remains responsible for the treatment plan.

Accessing pregnancy care across Australia

In Australia, start with the maternity clinician who knows your history: a GP can refer you to an obstetrician or midwife, while public maternity hospitals provide antenatal and emergency maternity care. Medicare-eligible patients generally receive free public maternity services, although private obstetric care and private hospital treatment can involve out-of-pocket costs. Large public units such as Royal Women’s Hospital in Melbourne and King George V Memorial Hospital for Mothers and Babies in Sydney also provide specialist pelvic and musculoskeletal care.

For urgent symptoms, call 000 for chest pain, severe breathing difficulty, collapse, heavy bleeding or other emergencies. Healthdirect’s 1800 022 222 nurse line can advise on less immediate concerns, and the Commonwealth’s Pregnancy Birth and Baby service on 1800 088 008 can provide pregnancy information and referral guidance. If you are already booked into a maternity service, use its emergency number or attend its assessment area.

For pain that continues beyond a week, worsens, disturbs sleep or makes walking and working difficult, arrange a routine review rather than treating it as an inevitable part of pregnancy. A GP referral may qualify you for subsidised physiotherapy, although Medicare rebates and clinic fees vary. When describing symptoms, be precise: Australian mums may call the uterus the “tummy”, but telling the clinician whether pain is in the lower abdomen, flank, back, pelvis or calf can lead to a safer assessment.

A practical plan for the coming week

A simple plan can separate helpful daily changes from problems that need assessment. Use the following checklist over the next week, and keep the wording of the symptoms you record clear and specific.

• Track the pattern: Record when pain begins, where it sits, what triggers it, how long it lasts and any associated symptoms.
• Change position regularly: Move every 30 to 45 minutes while sitting, and avoid repeatedly twisting, reaching overhead or lifting heavy objects.
• Keep moving gently: Walk or swim on most days, adjusting the pace so symptoms settle rather than flare.
• Support your sleep: Use a side-sleeping position with pillows between the knees and under the belly.
• Respond to cramps: Straighten and flex the leg, massage the calf and drink water if you are thirsty.
• Review food and medicines: Keep fluid and food intake regular, and ask a clinician before beginning supplements or pain medicines.
• Know when to seek help: Contact the maternity team if symptoms worsen or limit daily activity, and seek urgent help for the warning signs described above.

Some discomfort is common at this stage, but pain that remains severe or limiting deserves attention. A review can identify whether the symptoms are muscular, pelvic, nerve-related or linked to another condition, allowing treatment to match the cause rather than simply mask it.