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Thank you for your question.
It sounds most likely like a nerve pain due to a pinched nerve at your lower back.
It also can be pain related to a blocked artery but in that case you would usually also have cold feet and feet cramping up prior to this.
I would recommend that you should have a MRI of your lower spine to have a look at your nerves and discs in your lower spine.
Let me know if you have more questions.
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