Nanotechnologies are about to irrupt in our universe, perhaps even in our “intimacy”, our body.  Nano breakthroughs could overwhelm the health sphere as well. In fact, it could very well be the sector in which things move fastest today. Chemical and biological captors enable a punctual and permanent diagnosis, offering infinitely more precise results than those obtained today. Medication vectors could introduce themselves everywhere and target a disease precisely. Biocompatible prosthetics are an example of multiplying possibilities. But one must remain cautious: these new scientific breakthroughs do pose new ethical problems.