The number after each area is how many registered trials in our index fall in it, all years and all statuses; a trial with conditions in several areas counts in each. Each link opens the area's daily list of newly registered trials.
- Symptoms and General Pathology (143,712 trials)
- Cancers and Other Neoplasms (106,626 trials)
- Nervous System Diseases (76,288 trials)
- Heart and Blood Diseases (64,573 trials)
- Urinary Tract, Sexual Organs, and Pregnancy Conditions (54,606 trials)
- Respiratory Tract (Lung and Bronchial) Diseases (52,250 trials)
- Nutritional and Metabolic Diseases (50,240 trials)
- Behaviors and Mental Disorders (49,329 trials)
- Immune System Diseases (47,396 trials)
- Infections (46,301 trials)
- Digestive System Diseases (46,296 trials)
- Skin and Connective Tissue Diseases (37,969 trials)
- Gland and Hormone Related Diseases (35,670 trials)
- Blood and Lymph Conditions (29,453 trials)
- Muscle, Bone, and Cartilage Diseases (28,061 trials)
- Diseases and Abnormalities at or Before Birth (24,737 trials)
- Wounds and Injuries (18,481 trials)
- Eye Diseases (14,585 trials)
- Mouth and Tooth Diseases (12,693 trials)
- Ear, Nose, and Throat Diseases (7,564 trials)
- Substance Related Disorders (7,423 trials)
- Occupational Diseases (707 trials)