Recovered memories.

From a 2006 paper by Elizabeth Loftus and Deborah Davis:

Many, if not most, patients enter therapy in search of an explanation for their problems. This very need for explanation may render patients vulnerable to accepting seemingly plausible potential causes.
Believing a patient was abused, a therapist might directly suggest this hypothesis, as well as provide apparently confirmatory “evidence,” such as the extent to which the patient’s symptoms conform to those thought to be associated with abuse.
Particularly when combined with other “evidence” gleaned from survivor literature, survivor groups, media, and other sources, the abuse hypothesis may seem a compelling explanation to patients who fail to realize their symptoms may be better explained in other ways...

(PDF download) https://webfiles.uci.edu/eloftus/LoftusDavisAnnualReview06.pdf?uniq=-qcmbr3