My right leg is hurting, in between my thigh and hip, and lower back. at times it locks up on me when walking. what can it be?

,thigh pain: The problem could be a very tight hamstring muscle or the discomfort could be referred pain from a disc bulge or rupture in the lower spine. Consult an orthopedic surgeon for evaluation and if it's a hamstring problem physical therapy will be helpful. After the assessment, the specialist may schedule you for an mri of the lower spine if disc disease is suspected.