Transforaminal epidural steroid injections are a popular, minimally invasive, non-operative treatment option for back and leg pain. They are used to relieve pain arising from irritated nerves in the lumbar spine. Causes of this irritation include things such as herniated discs, degenerating discs, and arthritic spinal joints. All of these may contribute to make the nerve’s less comfortable, making you less comfortable. You may recognize it as low back pain with sharp pain radiating into one or both legs.