Low backache (low back pain) is very common in adults aged 20–70. In most cases it improves with simple care, but sometimes it can be a sign of a more serious problem. This guide explains common causes, safe home care, and red flags that need urgent medical attention. Common causes of low backache Muscle strain or ligament sprain (lifting, sudden movement, poor posture) Degenerative changes (age-related wear and tear) Disc bulge/herniation causing sciatica (pain radiating to