2026 data ClinicalTrials.gov official source

Conditions: A

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

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

2,835 conditions starting with "A"

Showing 551–600 of 2,835

Condition	Trials	Recruiting
Adenocarcinoma of the Rectum	12	5
Adenocarcinoma of the Stomach	3	-
Adenocarcinoma, Pancreatic Ductal	1	1
Adenoid Cystic Carcinoma	17	9
Adenoid Cystic Carcinoma of the Salivary Gland	1	1
Adenoid Hypertrophy	3	-
Adenoidectomy	2	-
Adenoma	7	2
Adenoma and/or Adenocarcinoma	1	-
Adenoma Colon Polyp	1	1
Adenoma Detection Rate	1	1
Adenoma, Liver Cell	1	-
Adenomas	1	-
Adenomas Colon	1	-
Adenomatous Polyp	2	-
Adenomatous Polyposis	1	1
Adenomatous Polyposis Coli	2	1
Adenomatous Polyposis Coli (APC) Gene Mutation	1	1
Adenomyosis	3	-
Adenomyosis of Uterus	1	1
Adenosine	1	1
Adenosine Deaminase Severe Combined Immune Deficiency	1	1
Adenosine Triphosphate Activities	1	1
Adenosquamous Carcinoma	3	2
Adenosquamous Carcinoma of Cervix	1	-
Adenosquamous Cell Lung Cancer	1	-
Adenotonsillectomy	2	-
Adenoviral Conjunctivitis	1	-
Adenovirus	7	6
Adenovirus Infection	3	2
Adenovirus Infections	3	2
Adequate Vitamin C Status	1	1
ADH Inappropriate	1	-
ADHD	77	24
ADHD - Attention Deficit Disorder With Hyperactivity	4	4
ADHD - Combined Type	2	2
Adhd NOS	1	-
ADHD Predominantly Inattentive Type	1	1
ADHD, Predominantly Hyperactive - Impulsive	1	1
Adherence	2	-
Adherence to Hormone Therapy	1	-
Adherence to Physical Activity After Completing Cardiac Rehabilitation (CR) in Older Adults	1	1
Adherence, Medication	14	5
Adherence, Patient	12	2
Adherence, Treatment	6	2
Adhesion	1	-
Adhesions	1	-
Adhesive Capsulitis	3	1
Adhesive Capsulitis of Shoulder	2	1
Adhesive Small Bowel Obstruction	2	2

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