Please always consult your GP or a professional physician / doctor who understands the issue. If they confirm that you are able to train, then it should be fine to do so long as you speak to one of our instructors for advice before hand.
In the case of injury or illness, for safety purposes please inform your training partners of any potential issues. If you are in any doubt, it is best to wait until full recovery before coming back to training. Please note that you are ultimately responsible for your own safety, and you need to be sensible.