Fear of vomiting, known as emetophobia, is among the most disabling phobias that most people have never heard of. Those who live with it often avoid restaurants, travel and social situations, and some reconsider pregnancy, all because of an intense fear of being sick or of witnessing someone else be sick. Until recently there was almost no rigorous research on how to treat it.
That changed with a study by Riddle-Walker and colleagues in 2016, the first randomised controlled trial to test a CBT protocol designed specifically for emetophobia. A randomised controlled trial is the strongest test available: participants were assigned at random either to receive CBT or to wait. Those who received CBT showed real reductions in fear and avoidance. Those on the waiting list did not improve.
The finding matters because many people with emetophobia have been told nothing can help them, or have spent years in general therapy that was never shaped around the particular nature of their fear. Targeted, evidence-based treatment exists and produces genuine results.
CBT for emetophobia works by gradually helping a person face feared situations and thoughts in a structured way, while examining the catastrophic thinking that keeps the fear alive.
If fear of vomiting is limiting your life, psychologists who specialise in exactly this can help.
What a randomised controlled trial actually tests
A randomised controlled trial is considered the strongest way to establish whether a treatment causes improvement, rather than people simply getting better over time or benefiting from attention alone. Participants are assigned at random either to receive the treatment or to a comparison condition. Here the comparison was a wait list: people who had not yet received treatment but were assessed on the same schedule. Random assignment means differences between the groups afterwards can reasonably be attributed to the treatment rather than to who happened to volunteer.
What this study did
Riddle-Walker and colleagues ran the first such trial of a cognitive behaviour therapy protocol built specifically for specific phobia of vomiting, the clinical term for emetophobia. CBT combines gradual, structured exposure to feared situations or sensations with work on the anxious thoughts that maintain avoidance. Twenty-four participants, 23 women and one man, were randomly allocated to either 12 sessions of the protocol or to the wait list. The researchers also used assessment tools designed to measure SPOV symptoms rather than generic anxiety questionnaires, which had not been done in a trial for this phobia before.
What the study found
At the end of treatment the CBT group showed significantly greater improvement than the wait-list group on the Specific Phobia of Vomiting Inventory. The effect size, a standardised measure of how large a difference the treatment made, was large at a Cohen's d of 1.53. As a rough guide, values above 0.8 are generally considered large in psychological research. Looking at individual outcomes, half of the CBT group, 6 people or 50%, showed clinically significant change, meaning their scores moved from the clinical to the non-clinical range in a meaningful way. On the wait list, 2 people or 16% did so. Reliable improvement, meaning a statistically dependable reduction unlikely to reflect ordinary measurement variation, was seen in 58.3% of the CBT group, 8 people, against 16% on the wait list.
Why it matters
Before this trial there was essentially no controlled evidence that any treatment worked for SPOV, despite how disabling the condition can be. The study demonstrates, using a proper control group and phobia-specific measures, that a structured CBT protocol produces change for a meaningful proportion of people. The improvement was large enough to be both clinically and statistically dependable in around half the sample.
Limits of this pilot
The researchers describe their work as a starting point rather than a settled answer. Not everyone who received CBT achieved reliable improvement or clinically significant change, and the authors note explicitly that further development is needed to make the treatment more effective. As a pilot trial it establishes CBT as a promising and testable treatment for SPOV. It does not yet show that the treatment works for everyone, or explain precisely why it helps those it does.
If a fear of vomiting is shaping your life, this research is a reason for hope, and a good reason to speak with a psychologist who understands this specific phobia.