The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.

• Adrenal Gland‏‎ (1 member)
• Autoimmune disease‏‎ (2 members)
• Biochemistry‏‎ (7 members)
• Biotechnology‏‎ (1 member)
• Clinical Neurology‏‎ (1 member)
• Dermatology‏‎ (4 members)
• Endocrinology‏‎ (2 members)
• Fractures‏‎ (1 member)
• Gastroenterology‏‎ (1 member)
• Genetics‏‎ (1 member)
• Immune System‏‎ (1 member)
• Immunoglobulins‏‎ (1 member)
• Inborn errors of metabolism‏‎ (2 members)
• Internal Medicine‏‎ (16 members)
• Medicine‏‎ (11 members)
• Metabolism‏‎ (2 members)
• Molecular Biology‏‎ (2 members)
• Neurology‏‎ (7 members)
• Orthopedics‏‎ (1 member)
• Rheumatology‏‎ (2 members)
• Signs in Medicine‏‎ (2 members)
• Systemic lupus erythematosus‏‎ (1 member)
• Vascular Disease‏‎ (1 member)
• Vitamins‏‎ (2 members)