The main reason why I changed my name for my last comment was that over the years I have noticed many "anti-doctor" comments on Mumsnet, and have for the most part bitten my tongue.
It amazes me that anyone would expect a diagnosis to be 100% guaranteed; nothing in this life is guaranteed. All that we can promise is advice based on a balance of probabilities. For example, if Ultrasound technology didn't exist, and a woman, who had been proven to be pregnant started to bleed heavily, the diagnosis would be "probable miscarriage"- not "definite"; as has been shown, sometimes the bleeding stops, and the pregnancy continues. Now that we have ultrasound we can be more certain that miscarriage has occurred, if a heartbeat isn't detected.BUT "heartbeat not detected" means just that and no more. Not "categorically no heartbeat exists" but, "I can't see one". The balance of probabilities is now in favour of miscarriage, but it does not mean that miscarriage has definitely occurred.
IMO, the problem lies not with doctors being fallible, but with the way that information is communicated BOTH WAYS. Doctors often do not say what the patient wishes to hear, and often patients do not tell the doctors what they are worried about. Patients are, of course, in a vulnerable position when in front of a doctor, and most of us would understand that, and try to comminicate effectively, but the constraints of the system are huge. I'm going to have to stop in a moment, as I have to go to a clinic where I am scheduled to see 30 patients this pm, 10 of whom have problems that are new to me. The clinic session lasts 3 hours (or should do), so an average of 6 minutes per patient, to include history, examination, interpretation of test results, explanation of any proposed treatment. If I try and cut down the number of patients per clinic, the GPs complain about the waiting times ( as do the patients). I can't win. If I do my best to explain things to a patient with a complicated problem, the next one will complain about the amount of time he's had to sit in the waiting room.
There are good doctors, and bad doctors, just the same as car mechanics, bakers, shop assistants, but even the good ones are struggling against a system that won't allow them to excel. It's not surprising that mistakes are made, even though they are devastating for the person on the receiving end.
Have to go- I've overrun my first 6- minute slot!