Lower Back Pain: Common Causes, Relief Options, and When to See a Doctor
You bent down to pick up groceries, and suddenly a sharp pain shot through your lower back. Or maybe it is a dull ache that has been building for weeks, making simple activities like standing or sitting uncomfortable. Lower back pain is very common and can affect mobility, sleep, work, and daily routines. The World Health Organization (WHO) identifies low back pain as a leading cause of disability worldwide. Many cases improve over time with practical self-care and gradual movement. However, persistent, recurring, or unexplained pain may need medical assessment to help identify the appropriate next step. This guide explains common lower back pain causes, safe relief options, warning signs that need urgent attention, and when it may be helpful to see a doctor or physiotherapist. If your pain is persistent, recurring, unexplained, or affecting your daily routine, a back pain assessment can help identify the next appropriate step. What Causes Lower Back Pain? Lower back pain, also called lumbar pain, can have several possible causes. It may involve muscles, ligaments, joints, discs, nerves, or another health condition. In many cases, there is not one clear structural cause for the pain. The World Health Organization notes that most low back pain is considered non-specific, meaning a specific disease or structural problem cannot be identified. The lower part of the spine supports body weight and allows bending, twisting, and other everyday movements. This can make the area more likely to feel sore or injured after strain, repetitive activity, prolonged sitting, or sudden movement. Muscle Strain and Ligament Sprain A muscle strain or ligament sprain can happen after lifting, twisting, overuse, sports, or an awkward movement. These injuries may cause localized pain, stiffness, tenderness, or muscle spasms. Sudden lifting, twisting, injury, repetitive activity, and prolonged sitting can all contribute to back pain for some people. These factors are also recognised in HealthLink BC’s guidance on low back pain and movement. Common features may include: Pain mainly felt in the lower back Stiffness or muscle spasms Discomfort that changes with movement Symptoms that improve gradually with activity modification and time Poor Posture and Ergonomic Issues Long periods of sitting, standing, or working in one position may contribute to lower back discomfort. A poorly adjusted chair, desk, screen, or workstation can also make symptoms worse for some people. Rather than focusing on “perfect posture,” it is usually more helpful to change positions regularly, take short movement breaks, and adjust your workstation to suit your body and work tasks. Common features may include: A dull or aching feeling that builds during the day Stiffness after sitting or standing for long periods Relief after changing position or taking a short walk Neck or shoulder tension from prolonged desk work Herniated Disc and Sciatica Discs sit between the bones of the spine and help cushion movement. A disc may bulge or herniate, which can sometimes irritate or put pressure on a nearby nerve. Sciatica is a term used for pain that travels from the lower back or buttock into the leg. It may also involve tingling, numbness, or weakness, as outlined in HealthLink BC’s sciatica guide. Possible symptoms include: Sharp, burning, or electric-shock-like pain into the buttock or leg Tingling or numbness in the leg or foot Weakness in the leg or foot Pain that becomes worse with certain movements, sitting, coughing, or sneezing Not every disc change causes symptoms. A health care professional can assess whether nerve irritation may be contributing to your pain. Degenerative Conditions and Arthritis Age-related changes in the spine can include disc changes, arthritis in the spinal joints, or narrowing around the nerves. These changes may be associated with stiffness, reduced range of motion, or pain that varies with activity. However, imaging changes do not always explain a person’s symptoms. Some people have age-related changes on scans without back pain, while others have pain without a clear finding on imaging. A medical assessment considers your symptoms, movement, medical history, and any warning signs before deciding on the next step. Lower Back Pain Symptoms That Need Urgent Medical Care Most lower back pain is not caused by an emergency. However, certain symptoms may point to serious nerve problems, infection, fracture, cancer, or another condition that needs urgent assessment. Call 9-1-1 or seek emergency care now if you have: New loss of bladder or bowel control New difficulty passing urine Numbness around the groin, genitals, buttocks, or inner thighs Severe or rapidly worsening weakness in one or both legs Back pain after a major fall, vehicle collision, or other significant trauma Severe back pain with abdominal pain, fainting, or feeling very unwell Seek prompt medical assessment if you have: Fever, chills, or other signs of infection Unexplained weight loss A history of cancer with new or worsening back pain New or worsening numbness, tingling, or weakness in the legs Pain that is getting worse, not improving, or significantly limiting daily activities Severe one-sided back or side pain with urinary symptoms, vomiting, or fever These symptoms do not always mean there is a serious condition, but they should be assessed promptly. Lower Back Pain Relief: What Helps at Home? For uncomplicated lower back pain without the warning signs listed above, self-care may help reduce discomfort and support a gradual return to normal activity. Stay Active Within Your Limits Long periods of bed rest are usually not recommended for uncomplicated back pain. Gentle movement and a gradual return to everyday activity may help reduce stiffness and make it easier to stay mobile. Short walks, light daily tasks, swimming, or gentle yoga may be suitable for some people. Avoid activities that sharply increase your pain, including heavy lifting, twisting, or high-impact exercise. Apply Heat or Ice Some people find ice, heat, or a combination of both helpful for short-term relief. Use the option that feels more comfortable for your symptoms. Apply a wrapped ice pack or heating pad for short periods, with a cloth barrier to protect your skin. Do not fall asleep with a heating
