- Calciphylaxis
- Candidiasis, Invasive
- Candidiasis, Mucocutaneous
- Cannabinoid Hyperemesis Syndrome
- Capacity (Competence) Determination and Informed Consent
- Carbon Monoxide Poisoning
- Carbon Monoxide Poisoning, Diagnosis and Management (algorithm)
- Cardiac Arrest
- Cardiac Arrhythmias (algorithm)
- Cardiac Tamponade
- Cardiomegaly (algorithm)
- Cardiomyopathy
- Carotid Sinus Hypersensitivity
- Carotid Stenosis
- Carpal Tunnel Syndrome
- Carpal Tunnel Syndrome (algorithm)
- Cataract
- Cataracts (algorithm)
- Celiac Disease
- Celiac Disease (algorithm)
- Cellulitis
- Cellulitis, Orbital
- Cellulitis, Periorbital
- Cerebral Palsy
- Cervical Bruit (algorithm)
- Cervical Hyperextension Injuries
- Cervical Hyperextension Injury (algorithm)
- Cervical Malignancy
- Cervical Polyps
- Cervical Spondylosis
- Cervicitis, Ectropion, and True Erosion
- Chancroid
- Charcot Joint (Neuropathic Arthropathy)
- Charcot-Marie-Tooth and Other Inherited Neuropathies
- Chemotherapy-Induced Neuropathies
- Chemotherapy-Related Mucositis
- Chest Pain/Acute Coronary Syndrome (algorithm)
- Chickenpox (Varicella Zoster)
- Chikungunya Fever
- Child Abuse
- Child Abuse (algorithm)
- Chlamydia Infection (Sexually Transmitted)
- Chlamydophila Pneumoniae
- Cholangitis, Acute
- Choledocholithiasis
- Cholelithiasis
- Cholera
- Cholestasis of Pregnancy, Intrahepatic
- Cholesteatoma
- Chronic Cough
- Chronic Joint Pain and Stiffness (algorithm)
- Chronic Kidney Disease
- Chronic Obstructive Pulmonary Disease (COPD), Diagnosis and Treatment (algorithm)
- Chronic Obstructive Pulmonary Disease and Emphysema
- Chronic Pain Management: An Evidence-Based Approach
- Cirrhosis, Primary Biliary
- Cirrhosis (algorithm)
- Cirrhosis of the Liver
- Clostridium Difficile Infection
- Clubbing (algorithm)
- Coarctation of the Aorta
- Coccidioidomycosis
- Colic, Infantile
- Colitis, Ischemic
- Colon Cancer
- Colonic Polyps
- Coma (algorithm)
- Complementary and Alternative Medicine
- Complex Regional Pain Syndrome
- Concussion, Sideline Evaluation (algorithm)
- Concussion (Mild Traumatic Brain Injury)
- Condylomata Acuminata
- Congenital Adrenal Hyperplasia
- Congenital Heart Disease in Adults
- Congenital Megacolon (Hirschsprung Disease)
- Congestive Heart Failure: Differential Diagnosis (algorithm)
- Conjunctivitis, Acute
- Constipation
- Constipation, Diagnosis and Treatment (Adult) (algorithm)
- Constipation, Treatment (Pediatric) (algorithm)
- Contraception
- Contraception (algorithm)
- Contrast Allergy and Reactions
- Corneal Abrasion and Ulceration
- Corns and Calluses
- Coronary Artery Disease and Stable Angina
- Cor Pulmonale
- Costochondritis
- Cough, Chronic (algorithm)
- Counseling Types
- COVID-19 Outpatient Testing (algorithm)
- Craniopharyngioma
- Crohn Disease
- Croup (Laryngotracheobronchitis)
- Cryoglobulinemia
- Cryptococcosis
- Cryptogenic Organizing Pneumonia
- Cryptorchidism
- Cryptorchidism (Undescended Testes) (algorithm)
- Crystal Arthropathies
- Cubital Tunnel Syndrome and Other Ulnar Neuropathies
- Cushing Disease and Cushing Syndrome
- Cushing Syndrome (algorithm)
- Cutaneous Drug Reactions
- Cutaneous T-Cell Lymphoma, Mycosis Fungoides
- Cutting and Self-Harm
- Cyanosis, Adult (algorithm)
- Cyanosis, Pediatric (algorithm)
- Cyberbullying
- Cyclic Vomiting Syndrome
- Cyst, Sebaceous (Epidermal Cyst)
- Cystic Fibrosis
- Cystic Hygroma
- Cytomegalovirus (CMV) Inclusion Disease
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