By Diana Buntajova A doctor has shared the tell-tale signs that pain could actually be an indicator that you have cancer \- and explains what you should do once you’ve identified it. Dr Deborah Lee, of Dr Fox Online Pharmacy, has revealed how to spot the difference between day-to-day muscle discomfort to noticing something more serious is wrong. She explained that if a certain pain continues for more than three weeks, then it is time to take a trip to the doctors. It comes as around 38 out of every 100 people with cancer will suffer from moderate to severe pain at some point during their battl…