| Chad |
| Chaetomium |
| Chagas Cardiomyopathy |
| Chagas Disease |
| Chalazion |
| Chalcogens |
| Chalcones |
| Chalones |
| Chamaecrista |
| Chamaecyparis |
| Chamaemelum |
| Chamomile |
| Chancre |
| Chancroid |
| Channel Islands |
| Chaperonin 10 |
| Chaperonin 60 |
| Chaperonins |
| Chaplaincy Service, Hospital |
| Chara |
| Characeae |
| Character |
| Charadriiformes |
| Charcoal |
| Charcot-Marie-Tooth Disease |
| Charities |
| Charts [Publication Type] |
| Charybdotoxin |
| Chediak-Higashi Syndrome |
| Cheese |
| Cheilitis |
| Cheirogaleidae |
| Chelating Agents |
| Chelation Therapy |
| Chelidonium |
| Chemexfoliation |
| Chemical Actions and Uses |
| Chemical and Pharmacologic Phenomena |
| Chemical Fractionation |
| Chemical Industry |
| Chemical Terrorism |
| Chemical Warfare |
| Chemical Warfare Agents |
| Chemiluminescent Measurements |
| Chemistry, Analytical |
| Chemistry, Bioinorganic |
| Chemistry, Clinical |
| Chemistry, Inorganic |
| Chemistry, Pharmaceutical |
| Chemoembolization, Therapeutic |
| Chemokines |
| Chemokines, C |
| Chemokines, CC |
| Chemokines, CX3C |
| Chemokines, CXC |
| Chemoprevention |
| Chemoreceptors |
| Chemosterilants |
| Chemotactic Factors |
| Chemotactic Factors, Eosinophil |
| Chemotactic Factors, Macrophage |
| Chemotaxis |
| Chemotaxis, Leukocyte |
| Chemotherapy, Adjuvant |
| Chemotherapy, Cancer, Regional Perfusion |
| Chenodeoxycholic Acid |
| Chenopodiaceae |
| Chenopodium |
| Chenopodium album |
| Chenopodium ambrosioides |
| Chenopodium quinoa |
| Chernobyl Nuclear Accident |
| Cherubism |
| Chest Pain |
| Chest Tubes |
| Chest Wall Oscillation |
| Chewing Gum |
| Cheyne-Stokes Respiration |
| Chi-Square Distribution |
| Chiari-Frommel Syndrome |
| Chicken anemia virus |
| Chickenpox |
| Chickenpox Vaccine |
| Chickens |
| Chicory |
| Chief Cells, Gastric |
| Chief Executive Officers, Hospital |
| Chikungunya virus |
| Chilblains |
| Child |