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i am currently training for a marathon in april. and i keep getting this very annoying pain in my right knee, which comes and goes. on a 20k run for example half way through it suddenly hurts so much i cant run any further, then i stop, wait for maybe 20 seconnds and keep on going a bit slower. and after a while the pain is gone.
then on a 30k run theres no problem at all. atm my knee even hurts when im just walking.
has anyone an idea whats wrong?
thank you for any help