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Is it a dull pain or a sharp shooting kind of pain?
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The pain is both.Much worse when on my feet for a long time.
Alright, do you have any back pain associated with this?
Since when have you been experiencing this pain?
And have you had any tests or discussed this with your physician?
About 4 months.
Is there any pain in the back of thigh and back of the knee?
Any "pins and needles" sensations?
Okay, judging from the details you have provided and your symptoms, this seems like nerve impingement in the lower lumbosacral plexus (lower back). This is also known as Sciatica.
The best course of action will be to avoid odd postures, avoid lifting anything heavy specially lifting things bending down from the ground.
Avoid prolonged sitting and standing, if you have to sit down for prolonged periods then use a doughnut pillow.
Massage the lower back area with Ibuprofen liquigel thrice daily.
Use Naproxen 550 mg twice a day for the pain as required.
But you should visit your physician and get an x ray of the lower back (2 views) to see if there is any degenerative disc disease that might have caused compression fractures of the vertebrae of the lower lumbosacral spine area.
This is the foremost cause of Sciatica along with disc herniation and prolapse.
Osteoporosis and weak bones due to demineralization (loss of calcium) can cause this condition. And a detailed evaluation will indicate the best treatment.
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Best wishes and feel better soon.