- C-Section see Cesarean Delivery
- C. diff Infections
- CABG see Coronary Artery Bypass Surgery
- CAD see Coronary Artery Disease
- Caffeine
- Calcium
- Calluses see Corns and Calluses
- CAM see Complementary and Integrative Medicine
- Campylobacter Infections
- Canavan Disease see Leukodystrophies
- Cancer
- Cancer Alternative Therapies
- Cancer and Pregnancy see Tumors and Pregnancy
- Cancer Chemotherapy
- Cancer Immunotherapy
- Cancer in Children
- Cancer--Living with Cancer
- Candidiasis see Yeast Infections
- Canes see Mobility Aids
- Canker Sores
- Cannabis see Marijuana
- Car Safety see Motor Vehicle Safety
- Car Seats see Motor Vehicle Safety
- Carbohydrate Metabolism Disorders
- Carbohydrates
- Carbon Monoxide Poisoning
- Carcinoid Tumors
- Carcinoma see Cancer
- Cardiac Arrest see Sudden Cardiac Arrest
- Cardiac Diseases see Heart Diseases
- Cardiac Failure see Heart Failure
- Cardiac Rehabilitation
- Cardiac Surgery see Heart Surgery
- Cardiac Test see Heart Health Tests
- Cardiomyopathy
- Cardiopulmonary Resuscitation see CPR
- Cardiospasm see Esophagus Disorders
- Cardiovascular Diseases see Heart Diseases; Vascular Diseases
- Careers see Health Occupations
- Caregiver Health
- Caregivers
- Caregivers for Alzheimer's Disease see Alzheimer's Caregivers
- Carotid Artery Disease
- Carotid Endarterectomy see Carotid Artery Disease; Ischemic Stroke
- Carpal Tunnel Syndrome
- Carsickness see Motion Sickness
- Cartilage Disorders
- Cat Bites see Animal Bites
- CAT Scans see CT Scans
- Cat Scratch Disease
- Cataract
- Causalgia see Complex Regional Pain Syndrome
- Cavities see Tooth Decay
- Celiac Disease
- Cell Phones see Electromagnetic Fields
- Cellulitis
- Cephalic Disorders see Brain Malformations
- Cerebellar Disorders
- Cerebral Aneurysm see Brain Aneurysm
- Cerebral Hemorrhage see Hemorrhagic Stroke
- Cerebral Palsy
- Cerebrovascular Disease see Stroke
- Cervical Cancer
- Cervical Cancer Screening
- Cervical Dysplasia see Cervix Disorders
- Cervical Pregnancy see Ectopic Pregnancy
- Cervical Spine see Neck Injuries and Disorders
- Cervix Disorders
- Cesarean Delivery
- CFS see Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
- Chagas Disease
- Chalazion see Eyelid Disorders
- Change of Life see Menopause
- Charcot-Marie-Tooth Disease
- Charley Horse see Muscle Cramps
- Chemical Emergencies
- Chemical Warfare see Chemical Emergencies
- Chemical Weapons see Chemical Emergencies
- Chemotherapy see Cancer Chemotherapy
- Chest Injuries and Disorders
- Chest Pain
- Chest Physical Therapy see Pulmonary Rehabilitation
- Chewing Tobacco see Smokeless Tobacco
- CHF see Heart Failure
- Chiari Malformation
- Chickenpox
- Chikungunya
- Chilblains see Frostbite
- Child Abuse
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- Child Development
- Child Mental Health
- Child Molestation see Child Sexual Abuse
- Child Nutrition
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- Child Sexual Abuse
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- Childbirth Problems
- Childhood Asthma see Asthma in Children
- Childhood Brain Tumors
- Childhood Cancer see Cancer in Children
- Childhood Leukemia
- Childhood Obesity see Obesity in Children
- Childhood Vaccines
- Children and Diabetes see Diabetes in Children and Teens
- Children and Medicines see Medicines and Children
- Children's Health
- Chiropractic
- Chlamydia Infections
- Choking
- Cholangiocarcinoma see Bile Duct Cancer
- Cholangitis see Bile Duct Diseases
- Cholecystectomy see Gallbladder Diseases
- Choledocholithiasis see Gallstones
- Cholelithiasis see Gallstones
- Cholera
- Cholestasis see Bile Duct Diseases
- Cholesterol
- Cholesterol Levels: What You Need to Know
- Cholesterol Medicines
- Chondrocalcinosis see Gout
- Chondromalacia Patellae see Knee Injuries and Disorders
- Choosing a Doctor or Health Care Service
- Chorea see Movement Disorders
- Chorionic Villi Sampling see Prenatal Testing
- Chromium see Minerals
- Chronic Bronchitis
- Chronic Fatigue Syndrome see Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
- Chronic Granulocytic Leukemia see Chronic Myeloid Leukemia
- Chronic Granulomatous Disease see Immune System and Disorders
- Chronic Illness, Coping see Coping with Chronic Illness
- Chronic Kidney Disease
- Chronic Lymphocytic Leukemia
- Chronic Myelogenous Leukemia see Chronic Myeloid Leukemia
- Chronic Myeloid Leukemia
- Chronic Obstructive Pulmonary Disease see COPD
- Chronic Pain
- Chronic Pancreatitis see Pancreatitis
- Churg-Strauss Syndrome see Eosinophilic Disorders
- Cicatrix see Scars
- Circulatory Disorders see Vascular Diseases
- Circumcision
- Cirrhosis
- CJD see Creutzfeldt-Jakob Disease
- CKD see Chronic Kidney Disease
- Clap see Gonorrhea
- Claudication see Leg Injuries and Disorders; Peripheral Arterial Disease
- Clavicle Injuries see Shoulder Injuries and Disorders
- Cleaning Products see Household Products
- Cleaning, Disinfecting, and Sanitizing
- Cleft Lip and Palate
- Cleft Palate see Cleft Lip and Palate
- Cleft Spine see Spina Bifida
- Climate Change
- Clinical Trials
- CLL see Chronic Lymphocytic Leukemia
- Cloning
- Clostridioides difficile infections see C. diff Infections
- Clostridium difficile infections see C. diff Infections
- Club Drugs
- Cluster Headache see Headache
- CML see Chronic Myeloid Leukemia
- CMV Infections see Cytomegalovirus Infections
- CO Poisoning see Carbon Monoxide Poisoning
- Coal Miner's Lung see Interstitial Lung Diseases
- Cocaine
- Coccidioidomycosis see Valley Fever
- Coccyx see Tailbone Disorders
- Cochlear Implants
- Cold (Temperature) see Frostbite; Hypothermia; Winter Weather Emergencies
- Cold and Cough Medicines
- Cold Sores
- Cold, Common see Common Cold
- Colic see Common Infant and Newborn Problems
- Colitis see Ulcerative Colitis
- Collapsed Lung
- Collarbone Injuries see Shoulder Injuries and Disorders
- College Health
- Colon Cancer see Colorectal Cancer
- Colonic Diseases
- Colonic Polyps
- Colonoscopy
- Color Blindness
- Colorado Tick Fever see Tick Bites
- Colorectal Cancer
- Colostomy see Ostomy
- Coma
- Common Cold
- Common Infant and Newborn Problems
- Communicable Diseases see Infectious Diseases
- Communicating With Your Healthcare Provider see Talking With Your Doctor
- Communication Disorders see Speech and Communication Disorders
- Complementary and Integrative Medicine
- Complex Regional Pain Syndrome
- Compression Fracture see Spine Injuries and Disorders
- Compulsive Gambling
- Concussion
- Conduct Disorder see Child Behavior Disorders
- Condylomata Acuminata see Genital Warts
- Confidentiality see Personal Health Records
- Congenital Adrenal Hyperplasia see Adrenal Gland Disorders
- Congenital Diaphragmatic Hernia see Hernia
- Congenital Heart Defects
- Congestive Heart Failure see Heart Failure
- Conjunctivitis see Pink Eye
- Connective Tissue Disorders
- Constipation
- Contact Dermatitis see Rashes
- Contact Lenses see Eye Wear
- Contraception see Birth Control
- Contusions see Bruises
- Cooley's Anemia see Thalassemia
- COPD
- Coping with Chronic Illness
- Coping with Disasters
- Copper see Minerals
- Copper Storage Disease see Wilson Disease
- Cor Pulmonale see Pulmonary Hypertension
- Cord Blood see Stem Cells
- Corn Syrup see Carbohydrates
- Corneal Disorders
- Corns and Calluses
- Coronary Arteriosclerosis see Coronary Artery Disease
- Coronary Artery Bypass Graft see Coronary Artery Bypass Surgery
- Coronary Artery Bypass Surgery
- Coronary Artery Disease
- Corticosteroids see Steroids
- Cosmetic Surgery see Plastic and Cosmetic Surgery
- Cosmetics
- Costochondritis see Cartilage Disorders
- Cough
- Cough Medicines see Cold and Cough Medicines
- COVID-19 (Coronavirus Disease 2019)
- COVID-19 Testing
- COVID-19 Vaccines
- Coxsackievirus Infections see Viral Infections
- CPR
- Crab Lice see Sexually Transmitted Infections
- Crack see Cocaine
- Cramps see Muscle Cramps
- Cranial Injuries see Head Injuries
- Craniofacial Abnormalities
- Craniofacial Injuries see Facial Injuries and Disorders
- Craniosynostosis see Craniofacial Abnormalities
- Creutzfeldt-Jakob Disease
- Crib Death see Sudden Infant Death Syndrome
- Critical Care
- Crohn's Disease
- Crossed Eyes see Eye Movement Disorders
- Croup
- Crutches see Mobility Aids
- Cryptococcosis see Fungal Infections
- Cryptosporidiosis
- CT Scans
- Cubital Tunnel Syndrome see Elbow Injuries and Disorders
- Cushing's Syndrome
- Cutaneous Disorders see Skin Conditions
- Cutting see Self-Harm
- CVA see Stroke
- Cyclothymic Disorder see Mood Disorders
- Cystic Fibrosis
- Cystic Kidney Diseases see Kidney Cysts
- Cystitis see Interstitial Cystitis
- Cystocele see Pelvic Floor Disorders
- Cytomegalovirus Infections
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