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Pain in both caves upon initiating some activity and then lessening of pain with activity, indicates deep vein thrombosis with faulty valves of deep veins. It can also be due to pinched nerve caused by ankylosing spondylitis or a herniated disc of the spin.
Hence first you must consult a vascular specialist and get a duplex ultrasound or color dopplar of the leg blood vessels. If this is clear then MRI of the lower spine should be done.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
Doctornees comments were on-the-money in describing the possibilities.
What you have is a potentially life-threatening situation.
If in fact the diagnosis turns out to be deep vein thrombosis, untreated, mortality is significant.
That means an immediate trip to the emergency room. Not a three-week wait for a visit with a GP.
In the United States these symtpoms would result in an immediate evaluation.
Hopefully, a pinched nerve is the problem, but you should not be playing "Russian Roulette".
We are seeking medical attention today. Thanks to you for your help. We will let you know what develops.