Dr. Condor, in Stefan Zweig's novel "Beware of Pity":
"""
Don’t you know the medical tricks we play? When we don’t know what to do ourselves, we play for time, we keep patients occupied with chatter and little activities so that they won’t notice how baffled we are. Luckily for us, an invalid’s own nature is usually our ally.
Of course she feels better!
Any kind of treatment, eating lemons or drinking milk, cold-water treatment or hot-water treatment, will bring about an initial change in the organism and provide a stimulus that the ever-optimistic patient takes for improvement. That kind of auto-suggestion is our best assistant; it even helps the biggest fools among us doctors.
But there’s a snag—as soon as the charm of novelty has worn off, reaction will set in, and then you have to switch your approach in a hurry, pretend there’s a new treatment, and so we doctors manipulate our approach in really severe cases until perhaps the real, right method of treatment is found.
"""