The number after each condition is how many registered trials in our index study it or a narrower condition, all years and all statuses. Each link opens the full list.
Top A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
- Obesity (11,327 trials)
- Overweight (3,520 trials)
- Ovarian Neoplasms (3,257 trials)
- Osteoarthritis, Knee (3,206 trials)
- Osteoarthritis (2,689 trials)
- Osteoporosis (1,553 trials)
- Opioid-Related Disorders (1,470 trials)
- Obesity, Morbid (931 trials)
- Ocular Hypertension (654 trials)
- Osteoarthritis, Hip (634 trials)
- Obsessive-Compulsive Disorder (625 trials)
- Osteosarcoma (469 trials)
- Oligodendroglioma (410 trials)
- Oropharyngeal Neoplasms (367 trials)
- Osteoporosis, Postmenopausal (330 trials)
- Out-of-Hospital Cardiac Arrest (309 trials)
- Obesity, Abdominal (289 trials)
- Osteonecrosis (258 trials)
- Occupational Stress (232 trials)
- Obstetric Labor, Premature (228 trials)
- Otitis Media (219 trials)
- Onychomycosis (134 trials)
- Orthomyxoviridae Infections (95 trials)
- Osteomyelitis (95 trials)
- Obstetric Labor Complications (88 trials)
- Optic Neuritis (87 trials)
- Osteoporotic Fractures (86 trials)
- Oppositional Defiant Disorder (85 trials)
- Opioid-Induced Constipation (84 trials)
- Osteogenesis Imperfecta (84 trials)
- Optic Nerve Glioma (82 trials)
- Otitis Media with Effusion (79 trials)
- Otitis (78 trials)
- Obesity Hypoventilation Syndrome (72 trials)
- Olfaction Disorders (70 trials)
- Opiate Overdose (68 trials)
- Overbite (68 trials)
- Ovarian Cysts (67 trials)
- Oculocerebral hypopigmentation syndrome type Preus (65 trials)
- Otorhinolaryngologic Diseases (63 trials)
- Orthostatic Intolerance (62 trials)
- Oligospermia (61 trials)
- Ovarian Hyperstimulation Syndrome (61 trials)
- Optic Nerve Diseases (60 trials)
- Ornithine Carbamoyltransferase Deficiency Disease (59 trials)
- Ocular Motility Disorders (56 trials)
- Oral Ulcer (52 trials)
- Orientation, Spatial (50 trials)
- Occupational Diseases (49 trials)
- Ototoxicity (49 trials)
- Optic Neuropathy, Ischemic (46 trials)
- Optic Atrophy, Hereditary, Leber (44 trials)
- Ovarian Diseases (43 trials)
- Opportunistic Infections (41 trials)
- Overnutrition (41 trials)
- Ossification, Heterotopic (38 trials)
- Onchocerciasis (35 trials)
- Osteomalacia (34 trials)
- Ovarian Germ Cell Cancer (30 trials)
- Orbital Fractures (29 trials)
- Osteochondritis Dissecans (29 trials)
- Orgasm (28 trials)
- Obesity, Metabolically Benign (27 trials)
- Oral Manifestations (26 trials)
- Oligohydramnios (24 trials)
- Otosclerosis (23 trials)
- Osteopetrosis (22 trials)
- Osteitis Deformans (21 trials)
- Osteolysis (21 trials)
- Osteoradionecrosis (20 trials)
- Osteochondrodysplasias (18 trials)
- Occupational Injuries (17 trials)
- Open Bite (17 trials)
- Optic Atrophy (16 trials)
- Optic Nerve Injuries (16 trials)
- Oroantral Fistula (16 trials)
- Otomycosis (16 trials)
- Odontogenic Cysts (15 trials)
- Osteochondrosis (15 trials)
- Oral Submucous Fibrosis (14 trials)
- Organophosphate Poisoning (14 trials)
- Osteoarthritis, Spine (14 trials)
- Otorhinolaryngologic Neoplasms (14 trials)
- Oligomenorrhea (13 trials)
- Oliguria (13 trials)
- Olecranon Fracture (12 trials)
- Ophthalmoplegia, Chronic Progressive External (12 trials)
- Otitis Externa (12 trials)
- Ovarian Torsion (12 trials)
- Overtraining Syndrome (12 trials)
- Oncogenic osteomalacia (11 trials)
- Ossification of Posterior Longitudinal Ligament (11 trials)
- Osteosclerosis (11 trials)
- Obsessive Behavior (10 trials)
- Onchocerciasis, Ocular (10 trials)
- Orbital Cellulitis (10 trials)
- Orbital Neoplasms (9 trials)
- Osteitis (9 trials)
- Osteoma, Osteoid (9 trials)
- Optic Atrophy, Autosomal Dominant (8 trials)
- Osteogenesis Imperfecta, Type IV (8 trials)
- Ovotesticular Disorders of Sex Development (8 trials)
- Ocular Hypotension (7 trials)
- Orbital Diseases (7 trials)
- Otitis Media, Suppurative (7 trials)
- Oculocerebrorenal Syndrome (6 trials)
- Organizing Pneumonia (6 trials)
- Orthorexia Nervosa (6 trials)
- Ophthalmoplegia (5 trials)
- Opsoclonus-Myoclonus Syndrome (5 trials)
- Optic Atrophies, Hereditary (5 trials)
- Optic Disk Drusen (5 trials)
- Osteochondritis (5 trials)
- Osteolysis, Essential (5 trials)
- Osteopetrosis, mild autosomal recessive form (5 trials)
- Ostracism (5 trials)