Blast of hot spot in the leg and pain as shock
in low back, are symptoms of nerve irritation
.It is possible that you have some back pathology (for example herniated disc
) that is compressing a nerve and these symptoms appear.You must go to your doctor.He will examine you and,perhaps,will request additional test for establish right diagnosis and treatment.
I wish you good health.
(In case the answer would have been useful please indicate this)