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 2,201–2,250 of 2,954

Condition	Trials	Recruiting
Comorbid Post-Traumatic Stress Disorder and OCD	1	1
Comorbidities and Coexisting Conditions	2	-
Comorbidity	1	1
Comparative Effectiveness	1	1
Comparative Effectiveness Research	1	-
Compare Performance of Colonoscopists	1	-
Compare Pregnancy Rates Between FSH Stimulation and FSH and	1	-
Comparing Manual and AI Patient Screening in Heart Failure	1	1
Compartment Syndrome	1	-
Compartment Syndrome of Leg	1	1
Compartment Syndrome Traumatic Lower Extremity	1	-
Compartment Syndromes	1	1
Compassion Fatigue	3	1
Compensated Cirrhosis	1	-
Competence	1	-
Complement 3 Glomerulonephritis	1	-
Complement 3 Glomerulopathy	2	-
Complement 3 Glomerulopathy (C3G)	2	-
Complement-mediated Kidney Disease	1	1
Complementary Therapies	1	1
Complete DiGeorge Anomaly	2	1
Complete DiGeorge Syndrome	2	1
Complete Heart Block	1	-
Complete Response	2	-
Complex Abdominal Aortic Aneurysm	2	2
Complex Aneuploidy	1	1
Complex Aortic Aneurysms	2	2
Complex Atypical Endometrial Hyperplasia	1	1
Complex Cardiovascular Surgery With Cardiopulmonary Bypass	1	1
Complex Care	1	-
Complex Congenital Heart Defect	4	1
Complex Congenital Heart Disease	1	1
Complex Cryptoglandular Fistula	1	-
Complex Medical Patients	1	1
Complex Obstetric Surgery	1	1
Complex Partial Seizure	1	-
Complex Perianal Fistula	2	-
Complex Post-Traumatic Stress Disorder	1	-
Complex Posttraumatic Stress Disorder	1	1
Complex Regional Pain Syndrome	4	2
Complex Regional Pain Syndrome (CRPS)	3	-
Complex Regional Pain Syndromes	8	7
Compliance	1	1
Compliance, Medication	1	1
Compliance, Patient	3	1
Complicated Diverticulitis	1	-
Complicated Intra-abdominal Infection	1	-
Complicated Intra-abdominal Infections	1	-
Complicated Intra-abdominal Infections (cIAI)	1	1
Complicated Urinary Tract Infection	2	1

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

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