This usually is caused by pressure on the nerve
commonly as it exits your lower spine from a disc bulge or herniation, or possibly from a bone spur. Stretching exercises, physical therapy
, chiropractic care are all reasonable initial treatments. However, if the pain persists or is associated with more severe symptoms such as numbness
, weakness, or bowel
-- you need to seek medical attention from an orthopedic surgeon or neurosurgeon
. Stop running
until you figure this out.