Understanding When Patients Feel Sick But Doctors Find Nothing

Plain-English translation of NCT07849907 on ClinicalTrials.gov ↗ · Source last updated September 2026 · Translation generated October 2026 · How we translate trials

What is this trial?

This research study wants to understand what it's like when you feel certain you have a parasite or infestation, but doctors or other professionals tell you that nothing is wrong. The researchers will talk with you through interviews, ask you to fill out questionnaires, and do some simple thinking tasks — all online and from wherever you are — to learn more about the emotional and mental side of this confusing experience.

Very little is known about what people go through when they believe they have a parasite or infestation but professionals disagree with them. This study exists to gather real experiences so that doctors and mental health providers can better support people facing this difficult situation.

Do you qualify?

You likely qualify if…

you are between 18 and 70 years old
you are at least 50% certain you have an active parasite or infestation, even though a doctor has told you that you don't
you can read and speak English fluently
you have access to a computer or phone to participate online
you have never been diagnosed with schizophrenia or a related condition

You likely don't qualify if…

you are currently struggling with active substance use (other than nicotine or caffeine)
you have experienced a serious head injury in the past
you are currently taking antipsychotic medications
you have a medical or neurological condition that affects your thinking or memory
you have been diagnosed with a learning disability or cognitive disorder

What participation looks like

You will participate in a semi-structured interview where a researcher asks you about your experience, complete some questionnaires about your feelings and thoughts, and do a few simple cognitive tasks. The entire study takes a few hours and happens remotely over video or phone, so you can do it from home. There is no medication involved — this is purely a research interview to help us understand your experience better.

AI-generated summary from trial data · Oct 5, 2026 · Not medical advice

Trial locations(1 site)

United States

Vanderbilt University Medical Center, Nashville, Tennessee