C
- C. diff
- C. difficile colitis
- C. difficile infection
- Calciphylaxis
- Calluses and corns
- Cancer
- Cancer of unknown origin
- Cancer, acute lymphocytic leukemia
- Cancer, anal
- Cancer, basal cell
- Cancer, bladder
- Cancer, bone
- Cancer, breast
- Cancer, carcinoid tumors
- Cancer, cervical
- Cancer, chronic lymphocytic leukemia
- Cancer, chronic myelogenous leukemia
- Cancer, colon
- Cancer, endometrial
- Cancer, esophageal
- Cancer, eye melanoma
- Cancer, floor of the mouth
- Cancer, gallbladder
- Cancer, gastric
- Cancer, hairy cell leukemia
- Cancer, Hodgkin lymphoma
- Cancer, Hurthle cell
- Cancer, inflammatory breast
- Cancer, kidney
- Cancer, leukemia
- Cancer, liver
- Cancer, lung
- Cancer, male breast
- Cancer, Merkel cell
- Cancer, mesothelioma
- Cancer, mouth
- Cancer, multiple myeloma
- Cancer, nasopharyngeal
- Cancer, neuroblastoma
- Cancer, neuroendocrine
- Cancer, non-Hodgkin lymphoma
- Cancer, oral
- Cancer, ovarian
- Cancer, pancreatic
- Cancer, paraneoplastic syndromes
- Cancer, prostate
- Cancer, rectal
- Cancer, retinoblastoma
- Cancer, skin
- Cancer, soft tissue sarcoma
- Cancer, squamous cell
- Cancer, stomach
- Cancer, testicular
- Cancer, throat
- Cancer, thyroid
- Cancer, uterine
- Cancer, vagina
- Cancer, vulvar
- Cancer, Wilms’ tumor
- Candidiasis, oral
- Candidiasis, vaginal
- Canker sore
- Carbon monoxide poisoning
- Carbuncles and boils
- Carcinoid syndrome
- Carcinoid tumors
- Carcinoma of unknown primary
- Cardiac arrest, sudden
- Cardiac ischemia
- Cardiogenic shock
- Cardiomegaly
- Cardiomyopathy
- Cardiomyopathy, dilated
- Cardiomyopathy, hypertrophic
- Cardiospasm
- Cardiovascular disease
- Carotid artery disease
- Carotid artery stenosis
- Carotid insufficiency
- Carpal tunnel syndrome
- CAS
- Castleman disease
- Cataracts
- Cavernous malformations
- Cavities and tooth decay
- CDG
- CDH
- Celiac artery compression
- Celiac artery compression syndrome
- Celiac axis syndrome
- Celiac disease
- Celiac trunk compression syndrome
- CELLO
- Cellulite
- Cellulitis
- Central auditory processing disorder
- Central nervous system (CNS) lymphoma
- Central nervous system vascular malformations
- Central neurofibromatosis
- Central sleep apnea
- Cercarial dermatitis
- Cerebral aneurysm
- Cerebral palsy
- Cerebrospinal fluid leak
- Cerebrovascular accident
- Cerumen impaction
- Cervical cancer
- Cervical dystonia
- Cervical insufficiency
- Cervical osteoarthritis
- Cervical pain
- Cervical spondylosis
- Cervicitis
- CF
- Chagas disease
- Charcot-Marie-Tooth disease
- CHD
- Chemical dependency
- Chemo brain
- Chest pain
- Chest wall pain
- Chiari malformation
- Chickenpox
- Chilblains
- Child abuse
- Child maltreatment
- Childhood apraxia of speech
- Childhood asthma
- Childhood obesity
- Childhood schizophrenia
- Chlamydia
- Chlamydia trachomatis
- Cholangiocarcinoma (bile duct cancer)
- Cholangitis, primary sclerosing
- Cholecystitis
- Cholera
- Cholestasis of pregnancy
- Chondrosarcoma
- Chordoma
- Chorea, Huntington’s
- Choroid plexus carcinoma
- Chronic acid reflux
- Chronic adrenal insufficiency
- Chronic compartment syndrome
- Chronic cough
- Chronic daily headaches
- Chronic exertional compartment syndrome
- Chronic fatigue syndrome
- Chronic granulomatous disease
- Chronic hives
- Chronic kidney disease
- Chronic kidney failure
- Chronic lymphocytic leukemia
- Chronic lymphocytic thyroiditis
- Chronic myelogenous leukemia
- Chronic obstructive pulmonary disease
- Chronic pelvic pain
- Chronic renal failure
- Chronic rhinosinusitis
- Chronic sinusitis
- Chronic traumatic encephalopathy
- Chronic vulvar pain
- Churg-Strauss syndrome
- Cirrhosis
- CJD
- CKD
- Claudication
- Cleft lip and cleft palate
- Click-murmur syndrome
- Clinical depression
- CLL
- Clostridioides difficile infection
- Clostridium difficile infection
- Clubfoot
- Cluster headache
- Coarctation of the aorta
- Coccidioidomycosis
- Cold allergy
- Cold exposure
- Cold sore
- Cold urticaria
- Cold, common
- Colic
- Colitis, ischemic
- Colitis, microscopic
- Colitis, pseudomembranous
- Colitis, ulcerative
- Collapsed lung
- Colon cancer
- Colon polyps
- Colonic ischemia
- Color blindness
- Colorectal cancer
- Columnar epithelium lined lower esophagus
- Coma
- Common cold
- Common cold in babies
- Common variable immunodeficiency
- Common warts
- Complex regional pain syndrome
- Complicated bereavement
- Complicated grief
- Compressed nerve
- Compulsive gambling
- Compulsive hoarding syndrome
- Compulsive overeating
- Compulsive sexual behavior
- Compulsive stealing
- Concussion
- Condylomata acuminata
- Congenital adrenal hyperplasia
- Congenital biliary atresia
- Congenital diaphragmatic hernia (CDH)
- Congenital heart defects in children
- Congenital heart disease in adults
- Congenital hip dislocation
- Congenital megacolon
- Congenital mitral valve anomalies
- Congenital myasthenic syndromes
- Congenital plagiocephaly
- Congestive heart failure
- Conjoined twins
- Conjunctivitis
- Constipation
- Constipation in children
- Contact dermatitis
- Conversion disorder
- Cooley’s anemia
- COPD
- Corns and calluses
- Coronary artery disease
- Coronary microvascular disease
- Coronavirus disease 2019 (COVID-19)
- Corticobasal degeneration (corticobasal syndrome)
- Costochondritis
- Costosternal chondrodynia
- Costosternal syndrome
- Cough headaches
- Cough, chronic
- COVID-19
- COVID-19-associated multisystem inflammatory syndrome in children
- Crabs
- Cradle cap
- Cramp, muscle
- Cramps, menstrual
- Cranial arteritis
- Craniopharyngioma
- Craniosynostosis
- Creutzfeldt-Jakob disease
- Crib death
- Crohn’s disease
- Croup
- CRPS
- Cryoglobulinemia
- Cryptorchidism
- CSF leak (Cerebrospinal fluid leak)
- CTCL
- Curvature of the penis
- Curvature of the spine
- Cushing syndrome
- Cutaneous B-cell lymphoma
- Cutaneous T-cell lymphoma
- Cutting/self-injury
- CVA
- CVID
- Cyclic vomiting syndrome
- Cyclothymia (cyclothymic disorder)
- Cyclothymic disorder
- Cyst, Bartholin’s
- Cyst, ganglion
- Cyst, kidney
- Cyst, ovarian
- Cyst, pancreatic
- Cyst, pilonidal
- Cyst, spermatic
- Cystic fibrosis
- Cystitis
- Cystitis, interstitial
- Cystocele
- Cysts, epidermoid
- Cysts, sebaceous
- Cytomegalovirus (CMV) infection
- Cytomegalovirus infection