2026 data ClinicalTrials.gov official source

Conditions: O

Every condition beginning with O that has a registered US clinical trial, with how many studies cover each.

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829 conditions starting with "O"

Showing 401–450 of 829

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Condition Trials
Oral Lichen Planus 4
Oral Lichenoid Mucositis 1
Oral Lichenoid Reaction 1
Oral Malodor 1
Oral Malodor (Halitosis) 1
Oral Manifestations 1
Oral Microbiome 1
Oral Microbiome Health 1
Oral Motor Therapy 1
Oral Mucosal Disease 1
Oral Mucositis 11
Oral Neoplasm 1
Oral Pain 1
Oral Squamous Cell Carcinoma 6
Oral Squamous Cell Carcinoma (OSCC) 1
Oral Steroid-Dependent Asthma (Disorder) 1
Oral Thrush 1
Oral Tongue Squamous Cell Carcinoma 1
Oral Tumors 1
Oral Ulcers 1
Oral vs Vaporized THC 1
Orbital Atrophy 1
Orbital Cellulitis 1
Orbital Diseases 2
Orbital Ecchymosis 1
Orbital Edema 1
Orbital Fat Atrophy 1
Orbital Floor Fracture 1
Orbital Fractures 2
Orexin Antagonist 2
Organ Donation 2
Organ Dysfunction 1
Organ Dysfunction Syndrome, Multiple 1
Organ Failure 2
Organ Failure, Multiple 1
Organ or Tissue Transplant; Complications 1
Organ Perfusion Determined by Using NIRS Post Transcatheter PDA Occlusion or Medical Closure of PDA 1
Organ Preservation 2
Organ Transplant 4
Organ Transplant Failure or Rejection 1
Organ Transplant Rejection 1
Organ Transplants 2
Organic Acidemia 3
Organic Acidemias 1
Organizations 2
Organoids 1
Orgasmic Disorder 1
Orientation 1
Ornithine Carbamoyltransferase Deficiency 1
Ornithine Carbamoyltransferase Deficiency (Disorder) 1

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Data sourced from official public datasets. See our methodology for details.