2026 data ClinicalTrials.gov official source

Conditions: C

Compiled by PlainTrial · January 1, 2026

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

2,928 conditions starting with "C"

Showing 2,401–2,450 of 2,928

Condition	Trials	Recruiting
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	-
Consumption Frequency Versus Selection Frequency	1	-
Contact Dermatitis	4	-
Contact Lens	2	-
Contact Lens Acute Red Eye	1	-
Contact Lens Care	3	-
Contact Lens Comfort	1	1
Contact Lens Complication	1	-
Contact Lens Discomfort	3	-
Contact Lens Solution	1	-
Contact Lens Solutions	1	-
Contact Lens Wear	4	-
Contact Lens Wettability	1	-
Contact Lens-induced Corneal Disorder	1	-
Contact Lens-induced Corneal Fluorescein Staining	1	-
Contact Sensitization	1	-
Contact Tracing	1	-
Contactless Vital Sign Monitoring	1	-
Contiguous Stage II Adult Burkitt Lymphoma	1	-
Contiguous Stage II Mantle Cell Lymphoma	1	-
Contingency Management	6	3

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