Clinical trials
Questionnaire clinical trials
Below are recruiting questionnaire clinical trials, each written for real people, not researchers. We’re tracking 1,163 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06430918Enrolling by invitation
Nerve pain and sleep quality in knee osteoarthritis
This study looks at how nerve pain and sleep quality are related in people with knee osteoarthritis. It aims to help doctors better understand and treat pain.
IzmirAges 18–80 - NCT06421402Enrolling by invitation
Health program for chronic lung disease in Barcelona
This study tests a health program for people with serious lung conditions like COPD or hard-to-treat asthma, especially those who also have other health issues. It aims to see if the program helps them feel better and manage their health in Barcelona.
BarcelonaAges Up to 85 years - NCT06261333Enrolling by invitation
Quality of life study for HHT patients
This study looks at how hereditary hemorrhagic telangiectasia (HHT) affects your day-to-day life and well-being. By joining, you'll answer questions to help doctors better understand the impact of the condition.
Essen, North Rhine-WestphaliaAges 18 years+ - NCT06083155Enrolling by invitation
Dutch registry of coronary function tests
This study collects information from people who are already scheduled for a coronary function test, to learn more about heart vessel health. By joining, you help researchers understand patterns and improve care for others.
Nijmegen, GelderlandAges Any age - NCT05989412Enrolling by invitation
Mobile screening for depression in Rotterdam Zuid
This study uses a mobile app to screen for signs of major depression in adults from diverse backgrounds in Rotterdam Zuid. The goal is to find people who might have undiagnosed depression and guide them to care.
RotterdamAges 18 years+ - NCT05902026Enrolling by invitation
Questionnaire study for jaw-related headache and pain impact
This study tests a biopsychosocial questionnaire (a survey about thoughts, daily life, and pain) for people with jaw-related headaches from temporomandibular disorder (TMD). It may help researchers better understand what influences headache severity and how to support treatment planning.
Gaziantep, Hasan Kalyoncu UniversityAges 18–60 - NCT05388019Enrolling by invitation
VAD clinic visit study for new and returning patients
This trial looks at how well a specialized, multidisciplinary clinic works for people who have a ventricular assist device (VAD) and compares new VAD patients with those who have already had standard follow-up visits. It may help improve how care and check-ins are organized after your VAD is implanted.
Boston, MassachusettsAges 18 years+ - NCT05115461Enrolling by invitation
Study pain and balance in lumbar disc nerve pain
This trial studies how nerve pain from a slipped/herniated low-back disc affects postural (balance) stability. It may help researchers understand better ways to support balance and reduce nerve-related pain symptoms.
IzmirAges 18–60 - NCT04672174Enrolling by invitation
Cognitive screening study for adults with hearing loss
This study checks how well people with hearing loss perform on thinking and memory tests (cognitive screening). It may help researchers find better ways to spot thinking changes in people with hearing loss and understand what factors are involved.
Zurich, Canton of ZurichAges 50–90 - NCT04254133Enrolling by invitation
Study uses genetics to guide prostate cancer care and screening
This study collects saliva and health/family history information to learn how inherited (genetic) factors relate to prostate cancer. The goal is to improve how treatment and future screening are planned for people and families.
Seattle, WashingtonAges 35–89 - NCT04074356Enrolling by invitation
Tests for esophagus function using noninvasive body measurements
This study looks for noninvasive ways to measure how well your esophagus is moving. It may help doctors better evaluate swallowing and esophagus movement without relying only on invasive testing.
Nashville, TennesseeAges 18 years+
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Common questions
- Are there clinical trials for questionnaire?
- Yes. Clin2 currently lists 1,163 recruiting questionnaire studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a questionnaire trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a questionnaire trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.