2026 data ClinicalTrials.gov official source

Conditions: C

Compiled by PlainTrial, Clinical Trial Intelligence Editorial Process · January 1, 2026

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

2,954 conditions starting with "C"

Showing 2,401–2,450 of 2,954

Condition	Trials	Recruiting
Congenital or Acquired Limb Deficiency	1	-
Congenital Plasminogen Deficiency	1	-
Congenital Pseudarthrosis of Tibia	1	1
Congenital Renal Anomaly Nos	1	1
Congenital Scoliosis	1	1
Congenital Spinal Deformities	1	-
Congenital Thrombocytopenia	1	1
Congenital Thrombotic Thrombocytopenic Purpura	1	1
Congenital Upper Limb Differences	1	1
Congenital Uterine Anomaly	1	1
Congenital Vascular Disorder	1	1
Congenitally Corrected Transposition of the Great Arteries	1	1
Congential Hip Dysplasia	1	1
Congestion	2	1
Congestion, Nasal	1	-
Congestive Heart Failure	52	8
Congestive Heart Failure (CHF)	1	1
Congestive Heart Failure Chronic	2	2
Congestive Heart Failure(CHF)	3	3
Conjunctival Melanoma	1	-
Conjunctival Neoplasms	1	-
Conjunctival Staining	1	-
Conjunctivitis	3	-
Conjunctivitis, Allergic	1	-
Connectedness	3	2
Connectedness to Nature	1	-
Connective Tissue	1	1
Connective Tissue Defect	1	-
Connective Tissue Disease	3	1
Connective Tissue Diseases	6	2
Connective Tissue Disorder	2	2
Connective Tissue Disorders	2	-
Connective Tissue Graft	1	-
Conscious Sedation	2	-
Conscious Sedation Failure During Procedure	2	-
Consciousness Disorder	1	-
Consciousness Disorders	5	4
Consciousness, Level Altered	2	1
Consensus	1	1
Consensus Development	1	1
Consequences of Immunization Method	1	-
Consolidation	3	1
Constipation	55	15
Constipation - Functional	1	-
Constipation by Outlet Obstruction	1	1
Constipation-predominant Irritable Bowel Syndrome	1	-
Constitutional Mismatch Repair Deficiency Syndrome	2	1
Constrictive Bronchiolitis	1	-
Consultation, Remote	1	-
Consumption	1	-

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