Lower Back Pain in Women: Possible Causes and When to Seek Help

Common causes: muscles, joints and discs

Lower back pain is common and can arise from muscles, ligaments, joints or discs. It may follow lifting, an awkward movement, prolonged sitting or a change in activity, but sometimes there is no clear trigger. Pain can feel aching, sharp or stiff, and it may vary with movement. Most episodes improve over time, although pain can recur.

Changes in the discs and joints become more common with age and do not always cause symptoms. A disc bulge seen on MRI may be unrelated to the pain, which is one reason imaging results need to be interpreted alongside the history and examination. Pain travelling into the buttock or leg can suggest nerve irritation, but symptoms alone cannot establish the cause.

Pelvic, menstrual, pregnancy and urinary causes

In women, back or pelvic pain may sometimes be associated with menstrual cycles, endometriosis, fibroids, pregnancy or other gynaecological conditions. Urinary tract problems, kidney stones and some abdominal or bowel conditions can also cause pain that is felt in the back. The location of pain alone is not enough to identify the cause, and accompanying symptoms are important.

Tell a healthcare professional if pain is linked to periods, pregnancy, urinary symptoms, fever, nausea, changes in bowel habits or unusual bleeding. During pregnancy, back pain is common, but severe pain, fever, bleeding, contractions or urinary symptoms should be discussed promptly with maternity services or a doctor. Do not assume that persistent pelvic or back pain is simply muscular.

Left-sided, right-sided and pain that travels

Pain on one side can be caused by a muscle or joint problem, but depending on the location and other symptoms it may also relate to the kidneys, pelvis, bowel or other internal structures. Pain that travels down the leg may occur with nerve irritation, while pain that wraps around the side or abdomen may point to a different source. These patterns are clues, not a diagnosis.

a doctor may ask whether the pain is constant or intermittent, whether it changes with movement, whether it wakes you at night and whether you have numbness, weakness, fever or urinary symptoms. They may examine your back, hips, abdomen and nerves. The goal is to identify warning signs and decide whether treatment, tests or imaging would be useful.

Self-care, movement and treatment

For uncomplicated back pain, staying gently active is often more helpful than prolonged bed rest. Short walks, changing position regularly and gradually returning to usual activities can help maintain movement. Heat may ease stiffness for some people. If you are considering pain relief, check with a pharmacist or doctor if you are pregnant, have kidney or stomach problems, take other medicines or have a long-term condition.

Exercises should be appropriate to your ability and symptoms. Gentle mobility and strengthening can help some people, but stop and seek advice if an exercise causes significant worsening, new weakness or unusual symptoms. A physiotherapist or doctor can help you build a plan. Treatment depends on the cause; persistent pain may need a more detailed assessment rather than repeated self-treatment.

When imaging may help—and when it may not

Most uncomplicated lower back pain does not need an immediate scan. Imaging may be considered if there are warning signs, a suspected specific condition, persistent symptoms despite appropriate care, or if the result is likely to change treatment. MRI is useful for selected questions involving nerves, discs and other soft tissues; X-ray and CT answer different questions, especially about bones.

Imaging can reveal common age-related changes that are not the source of pain, and unnecessary scans can create worry or lead to additional investigations. A GP consultation helps decide whether a scan is likely to add useful information and which type is appropriate. A scan should support clinical assessment, not replace it.

Red flags: when to seek urgent help

Seek emergency medical assessment if back pain occurs with new difficulty passing urine, loss of bladder or bowel control, numbness around the genitals or buttocks, or progressive weakness in both legs. These can be signs of serious nerve compression that needs urgent assessment. Also seek prompt medical advice for back pain with fever, major trauma, unexplained weight loss, a history of cancer or severe rapidly worsening pain.

If you feel seriously unwell, have severe abdominal or pelvic pain, collapse, significant bleeding or other sudden alarming symptoms, do not wait for a private scan appointment. Use NHS 111, your GP, maternity services or emergency services according to the severity and nature of the symptoms.

Nine possible causes of lower back pain

Lower back pain can have more than one cause. Common possibilities include: (1) muscle or ligament strain; (2) disc-related pain; (3) age-related joint changes; (4) nerve irritation such as sciatica; (5) sacroiliac or hip-related pain; (6) menstrual pain or endometriosis; (7) pregnancy-related changes; (8) urinary or kidney problems; and (9) other abdominal or pelvic conditions. This list is not a diagnosis, and some causes overlap.

Clues can include whether pain changes with movement, travels down a leg, occurs with periods, follows an injury, or comes with fever, urinary symptoms or abdominal pain. Our doctor will consider the pattern, examine you and look for warning signs. The side of the back that hurts is not enough to determine the cause, and persistent pain should not be attributed to posture or menstruation without considering other possibilities.

Treatment depends on the cause. Many uncomplicated episodes improve with gentle activity and time, while some conditions need specific treatment or investigation. Seek urgent help for new bladder or bowel problems, numbness around the genitals or buttocks, progressive leg weakness or other severe warning signs.