Self-hypnosis audio for hot flashes: what a 250-woman trial found

What the trial tested

Researchers at Baylor University and the University of Michigan enrolled 250 postmenopausal women who had at least four hot flashes a day (or 28 a week). About a quarter (62 women) had a history of breast cancer, a group for whom hormone therapy is often not an option.^[1]

Half were asked to listen to a 20-minute self-hypnosis recording every day for six weeks. The recordings used relaxation and imagery of coolness. The other half got white noise recordings of the same length, also labeled “hypnosis”, with similar educational material. Participants were not told which one was the real treatment. That makes this a much tougher test than comparing hypnosis to doing nothing.^[1]

How big was the difference?

At six weeks, the self-hypnosis group’s hot flash score fell by 53.4% and the white noise group’s by 40.9%. The paper reports this week-6 difference as statistically significant (p = .04). At the 12-week follow-up the gap was 60.9% versus 44.2%.^[1]

One detail the headlines skipped: when the researchers compared the whole pattern of change across all three time points, the difference between groups just missed the usual significance cutoff (p = .06). The authors note this analysis was slightly underpowered.^[1]

Other measures pointed the same way:

• By week 12, 60.4% of women who finished the hypnosis program had their hot flash score cut at least in half, versus 42.2% in the sham group.
• Interference with daily life (a 10-item scale covering work, sleep, mood, enjoyment and more) dropped more with hypnosis: 56.6% versus 48.8% by week 12.
• 90.3% of the hypnosis group said they felt better, versus 64.3% of the sham group.
• In women with a history of breast cancer, the difference between groups was larger and clearly significant.

Safety and limits

Four women in the hypnosis group and five in the sham group reported mild adverse events, none judged related to the recordings. There were no moderate or severe events.^[1]

• Most participants were White, non-Hispanic, and highly educated, so results may not apply equally to everyone.
• Hot flashes were self-reported in diaries, and some women did not complete follow-up.
• Participants got weekly reminder calls from the study team, which a person using an app on their own would not.
• The lead author disclosed personal fees from Mindset Health outside this study.

What to take from it

If you have frequent hot flashes and can’t or don’t want to use hormone therapy, self-hypnosis audio is a low-risk option with controlled trial support. Talk to your clinician about the full range of treatments. Regular practice was part of the protocol: women in the hypnosis group reported listening about 8 to 11 times a week.^[1]

Hypnova was not the recording tested here and does not offer this specific protocol. For why the placebo question matters so much in hypnosis research, see the placebo question nobody answers.