“Explore our comprehensive A-Z guide on diseases and conditions. Discover detailed information on definitions, symptoms, causes, and treatments to better understand various health issues.”
- C. diff (Clostridioides difficile) Infection
- Cachexia (Wasting Syndrome)
- Cacophobia (Fear of Ugliness)
- CAD: Bifurcation Blockage
- CAD: In-Stent Restenosis
- Café-au-Lait Spots
- Calcaneal Stress Fracture
- Calcific Tendonitis
- Calciphylaxis
- Calcium Deposits
- Campylobacter Infection
- Canaliculitis
- Canavan Disease
- Cancer
- Cancer Cachexia
- Cancer Fatigue
- Candida Albicans
- Candida Auris
- Candida Parapsilosis
- Candidiasis
- Canker Sores
- Cannabis Hyperemesis Syndrome (CHS)
- Cannabis Use Disorder
- Capillary Leak Syndrome
- Carbapenem-Resistant Enterobacterales (CREs)
- Carbon Monoxide Poisoning
- Carcinoid Syndrome
- Carcinoma
- Carcinoma of Unknown Primary
- Carcinomatosis (Carcinosis)
- Cardiac Amyloidosis
- Cardiac Angiosarcoma
- Cardiac Arrest
- Cardiac Asthma
- Cardiac Cachexia
- Cardiac Rhabdomyoma
- Cardiac Sarcoidosis
- Cardiac Shunt
- Cardiac Tamponade
- Cardiac Tumor
- Cardiofaciocutaneous Syndrome
- Cardiogenic Pulmonary Edema
- Cardiogenic Shock
- Cardiomyopathy
- Cardiophobia
- Cardiorenal Syndrome
- Cardiotoxicity: Cancer Treatment & the Heart
- Cardiovascular Disease
- Cardiovascular Disease in Women
- Cardiovascular-Kidney-Metabolic (CKM) Syndrome
- Caregiver Burnout
- Carney Complex
- Caroli Disease
- Carotid Artery Aneurysm
- Carotid Artery Disease (Carotid Artery Stenosis)
- Carotid Artery Dissection
- Carotid Body Tumors
- Carpal Boss
- Carpal Tunnel Syndrome
- Carpenter Syndrome
- Caseous Necrosis
- Castleman Disease
- Cat Scratch Fever
- Cataracts (Age-Related)
- Catathrenia (Nocturnal Groaning)
- Catatonia
- Catatonic Schizophrenia
- Catecholaminergic Polymorphic Ventricular Tachycardia
- Cauda Equina Syndrome
- Caudal Regression Syndrome
- Cauliflower Ear
- Cavernous Malformation (Cavernoma)
- Cavernous Sinus Thrombosis
- Cavities
- Cedar Fever
- Celiac Disease
- Cellular Dermatofibroma
- Cellulite
- Cellulitis
- Cellulitis From a Bug Bite
- Central Cord Syndrome (CCS)
- Central Diabetes Insipidus (CDI)
- Central Nervous System Vasculitis
- Central Pain Syndrome
- Central Pontine Myelinolysis (Osmotic Demyelination Syndrome)
- Central Serous Retinopathy
- Central Sleep Apnea
- Cephalic Disorders
- Cephalopelvic Disproportion
- Cerebellar Degeneration
- Cerebral Amyloid Angiopathy
- Cerebral Edema (Brain Swelling)
- Cerebral Hypoxia
- Cerebral Palsy
- Cerebral Venous Sinus Thrombosis
- Cerebrospinal Fluid (CSF) Leak
- Cerebrovascular Disease
- Cerebrovascular Occlusive Disease
- Cervical Artery Dissection
- Cervical Cancer
- Cervical Dysplasia
- Cervical Dystonia
- Cervical Ectropion
- Cervical Kyphosis
- Cervical Myelopathy
- Cervical Polyp
- Cervical Radiculopathy (Pinched Nerve)
- Cervical Rib
- Cervical Spondylosis
- Cervical Vertigo
- Cervicitis
- Cervicogenic Headache
- Chafing
- Chagas Disease
- Chalazion
- Chancroid (Soft Chancre)
- Chapped Lips
- Charcot Foot
- Charcot-Marie-Tooth Disease (CMT)
- CHARGE Syndrome
- Charles Bonnet Syndrome
- Chauffeur Fracture (Radial Styloid Fracture)
- Chemical Burns
- Chemical Pregnancy
- Chemotherapy Brain Fog (Chemo Brain)
- Cherry Angioma
- Cherubism
- Chest Wall Tumor
- Chiari Malformation
- Chickenpox
- Chickpea Allergy
- Chigger Bites
- Chikungunya
- Chilblain Lupus
- Chilblains (Pernio)
- Childhood Apraxia of Speech
- Childhood Asthma
- Childhood Cancer (Pediatric Cancer)
- Childhood Non-Hodgkin’s Lymphoma
- Childhood Obesity
- Childhood Schizophrenia
- Chionophobia (Fear of Snow)
- Chipped Tooth
- Chlamydia
- Choanal Atresia
- Cholangiocarcinoma (Bile Duct Cancer)
- Cholangitis
- Cholecystitis (Gallbladder Inflammation)
- Choledocholithiasis
- Cholera
- Cholestasis
- Cholestasis of Pregnancy
- Cholesteatoma
- Cholesterol Emboli
- Cholinergic Urticaria
- Chondroblastoma
- Chondrosarcoma
- Chordoma
- Chorioamnionitis
- Choriocarcinoma
- Chorioretinitis
- Choroideremia
- Christianson Syndrome
- Chromophobia (Fear of Colors)
- Chronic Bronchitis
- Chronic Diarrhea
- Chronic Granulomatous Disease
- Chronic Hives
- Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)
- Chronic Kidney Disease
- Chronic Lymphocytic Leukemia (CLL)
- Chronic Migraine
- Chronic Myeloid Leukemia (CML)
- Chronic Obstructive Pulmonary Disease (COPD)
- Chronic Pain
- Chronic Pharyngitis
- Chronic Sinusitis
- Chronic Thromboembolic Pulmonary Hypertension (CTEPH)
- Chronic Total Occlusion
- Chronic Traumatic Encephalopathy (CTE)
- Chronic Venous Insufficiency (CVI)
- Chronophobia (Fear of Time)
- Chyle Leak
- Chylothorax
- Chyluria
- Ciguatera
- Circadian Rhythm Sleep Disorders
- Cirrhosis of the Liver
- Class III Obesity (Formerly Known as Morbid Obesity)
- Claudication
- Claustrophobia
- Claw Hand
- Claw Toes
- Clear Cell Renal Cell Carcinoma
- Clear Cell Sarcoma
- Cleft Lip and Cleft Palate
- Cleidocranial Dysplasia
- Clinical Depression (Major Depressive Disorder)
- Clinodactyly
- Cloacal Exstrophy
- Cloacal Malformations
- Clogged Milk Duct
- Clogged Pores
- Clostridium Perfringens
- Clubbed Fingers
- Clubfoot
- Cluster Headaches
- CNS lymphoma
- Coagulative Necrosis
- Coats Disease
- Cobblestone Throat
- Cockayne Syndrome
- Cockroach Allergy
- Coffin-Lowry Syndrome
- Cohen Syndrome
- Cold Agglutinin Disease
- Cold Feet
- Cold Urticaria
- Colic
- Colitis
- Collagen Vascular Disease
- Colles Fracture
- Coloboma
- Colon Polyps
- Colon Stricture
- Color Blindness
- Colorectal (Colon) Cancer
- Colpocephaly
- Coma (Persistent Vegetative State)
- Comminuted Fracture
- Common Age-Related Eye Problems
- Common Cold
- Common Variable Immunodeficiency (CVID)
- Commotio Cordis
- Communicating Hydrocele
- Compartment Syndrome
- Complement 3 Glomerulopathy (C3G)
- Complex Lymphatic Anomalies (Lymphangiomatosis)
- Complex Regional Pain Syndrome (CRPS)
- Complicated Grief
- Compound Fracture
- Compression Fractures
- Computer Vision Syndrome
- Concussion
- Conduct Disorder
- Conduction Aphasia
- Condylar Resorption
- Cone-Rod Dystrophy
- Confusional Arousals
- Congenital Adrenal Hyperplasia
- Congenital Central Hypoventilation Syndrome (CCHS)
- Congenital Diaphragmatic Hernia
- Congenital Glaucoma
- Congenital Hand Differences
- Congenital Heart Disease
- Congenital Muscular Dystrophy (CMD)
- Congenital Myasthenic Syndrome
- Congenital Myopathy
- Congenital Penile Curvature
- Congenital Rubella Syndrome
- Congenital Scoliosis
- Congenital Syphilis
- Congenital Urinary Abnormalities
- Congestive Heart Failure
- Conjoined Twins
- Conjunctival Cyst
- Conjunctival Melanoma
- Connective Tissue Diseases
- Constipation
- Constrictive Pericarditis
- Contact Dermatitis
- Convergence Insufficiency
- Conversion Disorder
- Cor Pulmonale (Right-Sided Heart Failure)
- Cording (Axillary Web Syndrome)
- Corneal Abrasion
- Corneal Disease
- Corneal Dystrophy
- Corneal Ectasia
- Corneal Edema
- Corneal Flash Burns
- Corneal Hydrops
- Corneal Ulcer
- Cornelia de Lange Syndrome
- Corns and Calluses
- Coronary Artery Calcification
- Coronary Artery Disease
- Coronary Artery Spasm
- Coronavirus, COVID-19
- Corpus Luteum Cyst
- Corticobasal Degeneration
- Costello Syndrome
- Costochondritis
- Cough Headache
- Cough-Variant Asthma
- Coulrophobia (Fear of Clowns)
- COVID Pneumonia
- COVID-19 in Children
- COVID-19 While Pregnant
- Cowden Syndrome
- CPTSD (Complex PTSD)
- Cracked Tooth (Fractured Tooth)
- Cradle Cap
- Craniopharyngioma
- Craniosynostosis
- Creutzfeldt-Jakob Disease (CJD)
- Cri du Chat Syndrome
- Cribriform Hymen
- Cricopharyngeal Spasm
- Crigler-Najjar Syndrome
- Critical Limb Ischemia
- Crohn’s Disease
- Croup
- Crouzon Syndrome
- Crow’s Feet (Lateral Canthal Lines)
- Cryoglobulinemia
- Cryptic Pregnancy
- Cryptococcosis
- Cryptogenic Organizing Pneumonia
- Cryptosporidiosis
- Crystals in Urine
- Cubital Tunnel Syndrome
- Cushing Syndrome
- Cutaneous B-Cell Lymphoma
- Cutaneous Lupus (Skin Lupus)
- Cutaneous T-Cell Lymphoma (CTCL)
- Cyanosis
- Cyanotic Heart Disease
- Cyberphobia (Fear of Computers)
- Cyclic Neutropenia
- Cyclic Vomiting Syndrome
- Cyclosporiasis
- Cyclothymia
- Cynophobia (Fear of Dogs)
- Cyst on Penis
- Cystic Acne
- Cystic Fibrosis
- Cystic Hygroma
- Cystic Kidney Disease
- Cysticercosis
- Cystine Stones
- Cystinosis
- Cystocele
- Cystoid Macular Edema
- Cytokine Release Syndrome (CRS)
- Cytomegalovirus (CMV)
- Cytomegalovirus (CMV) Retinitis
- Cytopenia