I am 4 weeks post operation of achillis tendon rupture , had my 2nd cast yesterday, feeling sever pain in culf while sanding up , shall i worry ?

Possible blood clot: You may simply have calf muscle soreness or something as serious as a blood clot. It is crucial you see your surgeon or a doctor to evaluate whether or not an ultrasound is needing to be completed. That test can diagnose blood clots. Blood clots that travel to the lung can be fatal so we take them very seriously.

Yes,: Because that could be a sign of re rupture, cast could be pressing against the skin what could cause an ulcer, a venous obstruction. Go back to your doctor and let them take a look.