Clear communication is always important (and not often achieved) between two people, especially doctor and patient. However, there is institutional jargon that medical professionals use among themselves which can go over the lay person's head or be misunderstood. (Same goes with other professions and industries). Since patients have more ready access to their records nowadays, IMO, some of the onus should also be on the patient to learn the jargon and not let it get the best of their fears and insecurities, etc. It's so geared that way.