A growing chorus of discontent suggests that the once-revered doctor-patient relationship is on the rocks.

The relationship is the cornerstone of the medical system  nobody can be helped if doctors and patients aren’t getting along. But increasingly, research and anecdotal reports suggest that many patients don’t trust doctors.

About one in four patients feel that their physicians sometimes expose them to unnecessary risk, according to data from a Johns Hopkins study published this year in the journal Medicine. And two recent studies show that whether patients trust a doctor strongly influences whether they take their medication.

The distrust and animosity between doctors and patients has shown up in a variety of places. In bookstores, there is now a genre of “what your doctor won’t tell you” books promising previously withheld information on everything from weight loss to heart disease.