You may notice lower back pain after a long day, around your period, during pregnancy or without any obvious trigger. Working out what causes lower back pain in females can feel confusing because several factors may overlap. The pain may come from the muscles and joints of the lower back, or it may be influenced by hormonal, pelvic or gynaecological changes. Looking at the timing, location and associated symptoms can provide useful clues, but it cannot confirm the cause on its own.
Common causes of lower back pain in females
Lower back pain often develops when the tissues around the spine are doing more work than they are used to. This can happen after lifting, repetitive bending, a sudden increase in exercise, prolonged sitting or a change in sleeping arrangements. Muscles may become sensitive, while the small joints or discs in the lower back can also contribute to pain.
Sometimes the pain starts after a clear event, such as moving furniture or landing awkwardly. At other times, it builds gradually while you are caring for children, working at a desk or managing a physically demanding job. Stress and poor sleep may increase muscle tension and make pain harder to settle, although they are not necessarily the original cause.
Pain from the lower back can spread into the buttock or upper thigh. This does not always mean a nerve is damaged. However, pain that travels further down the leg, or is accompanied by tingling, numbness or weakness, should be assessed by a qualified health professional. You can learn more about common musculoskeletal contributors on our page about lower back pain and sciatica.
How periods and hormonal changes may relate to back pain
Period pain can be felt in the lower abdomen, pelvis and lower back. The uterus contracts during menstruation, and these contractions can create aching or cramping that refers into the back. Some people also notice changes in bowel habits, fatigue, headaches or tenderness around the same time.
Hormonal changes across the menstrual cycle may affect how sensitive your muscles, joints and other tissues feel. You might notice that an old back problem becomes more noticeable before or during your period, then eases afterwards. Keeping a simple record of pain, bleeding, bowel symptoms, activity and cycle timing can help show whether there is a repeating pattern.
Period-related back pain is common, but severe pain is not something you have to simply accept. Pain that is getting worse, stopping you from normal activities, starting later in life or not improving with usual care deserves medical assessment. Your doctor or gynaecologist can consider causes such as endometriosis or other menstrual conditions, while a physiotherapist can assess movement and musculoskeletal contributors.
Pregnancy and postnatal changes
Pregnancy changes how your body carries weight and how you move. As the abdomen grows, your centre of mass shifts and the muscles around the pelvis and lower back may work differently. Ligaments also become more flexible during pregnancy, and this can alter how the pelvis and spine feel during walking, standing, rolling in bed or getting out of a chair.
Back pain during pregnancy can be mild and activity-related, or it can be more persistent. It may be felt across the lower back, around the pelvis or near the buttocks. Lifting an older child, carrying a car seat, feeding in an unsupported position and reduced sleep can add to symptoms after birth.
After delivery, your body is recovering while you may be doing more bending, carrying and prolonged sitting than usual. Abdominal and pelvic floor changes can also affect how you manage pressure and movement. A postnatal assessment can help identify safe ways to build strength and return to exercise.
If you are pregnant or recently gave birth, seek advice that takes your stage of pregnancy or recovery into account rather than pushing through increasing pain. Severe, rapidly worsening or unusual pain during pregnancy or after birth should be discussed promptly with your maternity care provider or doctor.
Pelvic health, endometriosis and other gynaecological considerations
The pelvis, hips, lower back and abdominal wall work together, so pain in one area can influence another. Pelvic floor muscles may become overactive or poorly coordinated, particularly when there has been pain, childbirth, constipation, persistent coughing or repeated straining. This may be associated with pelvic pressure, pain during intercourse, urinary symptoms or difficulty relaxing the muscles.
Endometriosis can cause pelvic pain and may also be associated with lower back pain, painful periods, pain during sex, bowel symptoms or difficulty becoming pregnant. These symptoms can vary from person to person. Lower back pain alone does not diagnose endometriosis, and not everyone with endometriosis has the same pattern.
Other gynaecological conditions may also cause pelvic or back symptoms. Pain linked with unusual bleeding, bleeding after sex, new discharge, fever, marked abdominal pain or a change in your usual cycle should be discussed with a doctor. A physiotherapist can support movement and pelvic health concerns, but medical assessment is needed when symptoms suggest an underlying gynaecological issue.
Work, posture, lifting and exercise-related strain
There is no single perfect posture, and sitting upright all day will not prevent every back problem. The bigger issue is often staying in one position for too long or repeating the same task without enough variation. Desk work, driving, standing at a bench, cleaning and nursing can all place repeated demands on the lower back.
Lifting is another common contributor. The risk is not simply whether your back is straight or bent. Load size, speed, twisting, fatigue, grip, footing and how often you lift all matter. When possible, keep a load close to your body, move your feet rather than twisting under load, and ask for help with awkward or heavy objects.
Exercise can irritate the back when training volume, intensity or technique changes quickly. This may happen after returning to running, weights, group classes or sport following a break. It is usually better to adjust the activity than stop all movement. Gentle walking and comfortable daily movement may be useful for many people, but any exercise that increases pain should be stopped and reviewed.
In practical terms, change position regularly, take short movement breaks and build activity gradually. A physiotherapist can help you work out which movements are aggravating symptoms and how to return to work, exercise or caring tasks safely. Individualised exercise programs may be included when they are appropriate for your symptoms.
How pain patterns can help identify possible contributors
The timing and behaviour of your symptoms can offer useful information. Pain that follows lifting, prolonged sitting or a change in training may point towards a musculoskeletal contributor. Pain that follows a predictable menstrual pattern may be related to period symptoms, although recurring or severe pain still deserves medical review.
Pain during pregnancy or after birth can reflect changes in load, sleep, lifting and movement. Symptoms that travel below the knee, or that occur with pins and needles, numbness or weakness, may involve irritation of a nerve and should be assessed. Pelvic pain, unusual bleeding, fever or urinary and bowel changes may require medical assessment rather than physiotherapy alone.
These patterns are clues, not a diagnosis. Keeping a record of when the pain occurs, what makes it better or worse, and any related symptoms can make it easier to explain your concerns to a doctor or physiotherapist.
When back pain may indicate a more serious concern
Most lower back pain is not caused by a dangerous condition, but some symptoms should not be ignored. Seek urgent medical care if back pain follows a significant accident, or if you develop new loss of bladder or bowel control, numbness around the inner thighs or genitals, or marked weakness in both legs.
Prompt assessment is also appropriate if pain is severe or rapidly worsening, you feel very unwell, or you have a fever with back or abdominal pain. Unexplained weight loss, a history of cancer, significant night pain, or pain that does not change with movement should be discussed with a doctor. New severe pain during pregnancy or after birth also warrants timely medical advice.
- Contact a health professional for persistent or recurring pain that affects sleep, work, exercise or daily tasks.
- Seek medical advice for back pain with unusual vaginal bleeding, severe pelvic pain, fever or concerning urinary or bowel symptoms.
- Seek urgent care for new bladder or bowel changes, saddle numbness or significant leg weakness.
These signs do not tell you exactly what is happening, but they help identify when self-management is not enough. If you are unsure, it is safer to ask for professional guidance.
What to expect from a physiotherapy assessment
A physiotherapy assessment starts with questions about when the pain began, what changes it, your work and exercise demands, your menstrual or pregnancy history, and any related symptoms. You can share only what you feel comfortable discussing, but information about pelvic, bladder, bowel or menstrual symptoms may help guide the assessment.
The physiotherapist may look at how you walk, bend, sit, lift or move your hips and spine. They may also assess strength, flexibility, balance and nerve-related signs where appropriate. This helps distinguish common movement and muscle contributors from symptoms that need referral to a doctor or another health professional.
Management may include advice about activity, lifting, work positions, sleep and pacing. You may be given gentle exercises matched to your symptoms and stage of recovery. Exercises should feel manageable, and you should stop if they cause a clear increase in pain, new symptoms or worsening symptoms.
Baysictechnique Physiotherapy in Mount Druitt supports people across Western Sydney with individual assessment and practical treatment planning. If your symptoms are persistent, recurring or affecting your everyday life, seeing a physiotherapist can be a useful step alongside medical care when needed. To discuss an assessment and practical next steps, call 0423 767 191 or book an appointment.