Urinary incontinence
Ruptured disks
Bulging disks
Sciatica
Arthritis
Abnormal curvature of the spine
Osteoporosis
Cauda equina syndrome
Cancer of the spine
Infection of the spine
Other infections
Sleep disorders
Shingles
Bad mattress
Bending awkwardly
Pushing something
Pulling something
Carrying something
Lifting something
Standing for long periods
Bending down for long periods
Twisting
Coughing
Sneezing
Muscle tension
Over-stretching
Sitting in a hunched position for long periods (e.g. when driving)
Long driving sessions without a break (even when not hunched).