What is being studied right now
Every condition we cover is cross-referenced against ClinicalTrials.gov, the public registry of clinical studies. This is where you can see what research is under way, what has finished, and go straight to the source.
A registered study is not evidence that something works. Registration simply means a study has been declared publicly before it runs — which is a good thing, because it stops unflattering results being quietly buried. Many studies find no benefit, and some find harm. Never pursue an experimental treatment on the strength of a registry entry, and never stop an existing treatment because something new is being trialled.
Why we link instead of summarise
Interpreting a clinical trial is genuinely difficult work. Sample size, endpoints, blinding, who funded it and what was left unpublished all change what a result means. We are not going to compress that into a headline, because the compression is exactly where health reporting usually goes wrong.
So we do something more modest and more useful: we tell you what exists, and hand you the registry entry so you can look at it — or take it to your doctor and ask.
Conditions with the most registered studies
Counts are the number of registry entries whose condition field matches the term, so they indicate research activity, not disease burden or importance. Broad groupings such as “Neurologic Diseases” are excluded from this ranking because they match thousands of studies across many unrelated conditions — you will still find their studies on their own pages.
- Cancer1,22,178 registered studies · 6 shown as active
- Pain37,009 registered studies · 6 shown as active
- Patient Safety32,132 registered studies · 6 shown as active
- Viral Infections28,105 registered studies · 6 shown as active
- After Surgery27,427 registered studies · 6 shown as active
- Birth Defects25,946 registered studies · 6 shown as active
- Diabetes24,177 registered studies · 6 shown as active
- Skin Cancer19,204 registered studies · 6 shown as active
- Body Weight17,165 registered studies · 6 shown as active
- Breast Cancer16,656 registered studies · 6 shown as active
- Cancer Chemotherapy16,512 registered studies · 6 shown as active
- Obesity14,715 registered studies · 6 shown as active
- Lung Cancer14,389 registered studies · 6 shown as active
- Allergy13,869 registered studies · 6 shown as active
- Stress12,678 registered studies · 6 shown as active
- Depression12,641 registered studies · 6 shown as active
- Tumors and Pregnancy12,429 registered studies · 6 shown as active
- High Blood Pressure12,413 registered studies · 6 shown as active
- Coronary Artery Disease11,993 registered studies · 6 shown as active
- Diabetes Type 211,818 registered studies · 6 shown as active
- Arthritis11,487 registered studies · 6 shown as active
- Pneumonia11,301 registered studies · 6 shown as active
- Cervical Cancer11,231 registered studies · 6 shown as active
- Lymphoma11,208 registered studies · 6 shown as active
- Stroke11,047 registered studies · 6 shown as active
- Anxiety10,365 registered studies · 6 shown as active
- Intestinal Cancer10,334 registered studies · 6 shown as active
- COVID-19 (Coronavirus Disease 2019)10,222 registered studies · 6 shown as active
- Colorectal Cancer10,190 registered studies · 6 shown as active
- HIV10,100 registered studies · 6 shown as active
- Anesthesia9,797 registered studies · 6 shown as active
- Infection Control9,763 registered studies · 6 shown as active
- Leukemia9,677 registered studies · 6 shown as active
- Childbirth9,166 registered studies · 6 shown as active
- Diets8,903 registered studies · 6 shown as active
- Radiation Therapy8,808 registered studies · 6 shown as active
- Head and Neck Cancer8,618 registered studies · 6 shown as active
- Bacterial Infections8,055 registered studies · 6 shown as active
- Fungal Infections8,009 registered studies · 6 shown as active
- Sexually Transmitted Infections7,853 registered studies · 6 shown as active
- Heart Failure7,773 registered studies · 6 shown as active
- Kidney Failure7,720 registered studies · 6 shown as active
- Chronic Pain7,627 registered studies · 6 shown as active
- Prostate Cancer7,519 registered studies · 6 shown as active
- Hodgkin Lymphoma7,150 registered studies · 6 shown as active
- Bleeding7,081 registered studies · 6 shown as active
- Dementia6,552 registered studies · 6 shown as active
- Osteoarthritis6,327 registered studies · 6 shown as active
- Drug Safety6,013 registered studies · 6 shown as active
- Metabolic Syndrome5,925 registered studies · 6 shown as active
- Arrhythmia5,923 registered studies · 6 shown as active
- HIV and Infections5,901 registered studies · 6 shown as active
- Bone Cancer5,783 registered studies · 6 shown as active
- Gastroenteritis5,718 registered studies · 6 shown as active
- Chronic Kidney Disease5,706 registered studies · 6 shown as active
- COPD5,493 registered studies · 6 shown as active
- Vaccine Safety5,390 registered studies · 6 shown as active
- Liver Cancer5,386 registered studies · 6 shown as active
- Heart Surgery5,381 registered studies · 6 shown as active
- Asthma5,248 registered studies · 6 shown as active
- Ovarian Cancer5,233 registered studies · 6 shown as active
- Anemia5,201 registered studies · 6 shown as active
- Pancreatic Cancer5,019 registered studies · 6 shown as active
- Hepatitis4,986 registered studies · 6 shown as active
- Hepatitis A4,983 registered studies · 6 shown as active
- Diabetes Complications4,927 registered studies · 6 shown as active
- Hormones4,811 registered studies · 6 shown as active
- Fractures4,801 registered studies · 6 shown as active
- Endoscopy4,745 registered studies · 6 shown as active
- Diabetes Type 14,599 registered studies · 6 shown as active
- Oral Cancer4,485 registered studies · 6 shown as active
- Back Pain4,467 registered studies · 6 shown as active
- Cancer Immunotherapy4,429 registered studies · 6 shown as active
- Brain Tumors4,426 registered studies · 6 shown as active
- Vitamins4,335 registered studies · 6 shown as active
- Stomach Cancer4,271 registered studies · 6 shown as active
- Uterine Cancer4,248 registered studies · 6 shown as active
- Acute Myeloid Leukemia4,247 registered studies · 6 shown as active
- Child Development4,238 registered studies · 6 shown as active
- Alzheimer's Disease4,198 registered studies · 6 shown as active
- Schizophrenia4,187 registered studies · 6 shown as active
- Atrial Fibrillation4,124 registered studies · 6 shown as active
- Gum Disease4,107 registered studies · 6 shown as active
- Disabilities4,066 registered studies · 6 shown as active
- Blood Clots3,999 registered studies · 6 shown as active
- Multiple Myeloma3,997 registered studies · 6 shown as active
- Ischemic Stroke3,954 registered studies · 6 shown as active
- Heart Attack3,904 registered studies · 6 shown as active
- Parkinson's Disease3,896 registered studies · 6 shown as active
- Multiple Sclerosis3,872 registered studies · 6 shown as active
- Smoking3,837 registered studies · 6 shown as active
- Sepsis3,775 registered studies · 6 shown as active
- Rheumatoid Arthritis3,745 registered studies · 6 shown as active
- Melanoma3,737 registered studies · 6 shown as active
- Antibiotics3,722 registered studies · 6 shown as active
- Respiratory Failure3,643 registered studies · 6 shown as active
- Paralysis3,633 registered studies · 6 shown as active
- Weight Control3,566 registered studies · 6 shown as active
- Atherosclerosis3,558 registered studies · 6 shown as active
- Moles3,483 registered studies · 6 shown as active
- Fatigue3,456 registered studies · 6 shown as active
- Alcohol3,414 registered studies · 6 shown as active
- Infections and Pregnancy3,392 registered studies · 6 shown as active
- Kidney Cancer3,363 registered studies · 6 shown as active
- Acute Lymphocytic Leukemia3,279 registered studies · 6 shown as active
- Child Safety3,242 registered studies · 6 shown as active
- Insomnia3,217 registered studies · 6 shown as active
- Shock3,217 registered studies · 6 shown as active
- Sleep Apnea3,129 registered studies · 6 shown as active
- Infertility3,101 registered studies · 6 shown as active
- Esophageal Cancer3,077 registered studies · 6 shown as active
- Soft Tissue Sarcoma3,026 registered studies · 6 shown as active
- Pain Relievers3,019 registered studies · 6 shown as active
- Premature Babies3,013 registered studies · 6 shown as active
- Knee Replacement3,001 registered studies · 6 shown as active
- Oxygen Therapy2,934 registered studies · 6 shown as active
- Malnutrition2,929 registered studies · 6 shown as active
- Sodium2,877 registered studies · 6 shown as active
- Birth Control2,864 registered studies · 6 shown as active
- Kidney Transplantation2,859 registered studies · 6 shown as active
Study counts from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. The registry is international but not exhaustive — studies registered only with other national registries will not appear. Registry entries are supplied by sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.