This is only loosely relevant, because it concerns pilots having minor medical complaints, not medical problems picked-up in a medical inspection.
My father, an RAF pilot in the 1930s to 1960s, always advised his fellow pilots to avoid going to the MO over minor medical complaints. He belly-landed a Vampire and a few months later went to the MO complaining of stomach pain when flying at altitude. The medics suspected an ulcer and did all possible checks, but came up with no explanation for his pain. The incident caused him to be medically down-graded, resulting in him being barred from flying overseas.
He subsequently received a tip-off from a WAAF he knew at the MoD that when it his name came up at promotion boards, he would be passed-over, the question being voiced 'Is he better yet?' I think there may have been some suspicion that he was funking it, having possibly 'lost his nerve' after his Vampire forced landing. Eventually he managed to persuade the medics to restore his medical grading, on the grounds that the pains no longer troubled him and concern about his frozen promotion was doing him no good at all. However, although he got his bill of health, the damage had by then been done... he was no longer in the promotional 'A' stream.
Thus his advice was to steer clear of the MO and go private for minor medical problems. With modern medical knowledge, it seems likely that his stomach pains were probably due to a gut-bloating bug like H-pylori, but of course, this was unheard-of in those days. He retired as a Wg Cdr, but cites this incident as being one of several factors that held him back from gaining higher promotion.