The bc nurse discussed lymphoedema with me before I went in to have the partial and sentinel node but as the others say, I think the risk is fairly low. Even so, it doesn't hurt to do the stretching regularly. I went to a well-being session earlier in the week and the president of the SA Lymphoedema Group passed on an exercise that is supposed to help the lymphatic system after mastectomy. Apparently, the key thing is SLOOOOWWWW. Stand straight with arms out to the side at chest height and bring your hands in to your chest (so your elbows are sticking out the the side) with the palms facing your body. Okay, you're now in the right position. For a slowish count of five, breathe in while moving your hands out to the side, extending your arms and keeping them at chest height. Hold position and breath for a further count of 5. Then bring your arms back, breathing out for a count of 5. Do this 5 times.