Calcium channel blocker toxicity
Calcium pyrophosphate deposition disease
Cancer pain
Cancer-associated cachexia
Cancer-associated fatigue
Cancer-associated thrombosis
Cancer-related anemia
Cannabis use disorder
CAR T-cell therapy-related toxicities
Carbon monoxide poisoning
Cardiac amyloidosis
Cardiac arrest
Cardiogenic shock
Cardiotoxicity of cancer therapy
Carotid artery stenosis
Carpal tunnel syndrome
Cat scratch disease
Catatonia
Catheter-associated urinary tract infection
Catheter-related bloodstream infection
Catheter-related thrombosis
Caustic ingestion
Cavernous malformations
Celiac artery aneurysm
Celiac disease
Cellulitis
Central airway obstruction
Central disorders of hypersomnolence
Central hypothyroidism
Central sleep apnea
Cerebral edema
Cerebral venous thrombosis
Cerumen impaction
Cervical artery dissection
Cervical cancer
Cervical insufficiency
Cervical spine injury
Cesarean delivery
Chagas cardiomyopathy
Chagas disease
Chancroid
Chemical- and radiation-induced hemorrhagic cystitis
Chemotherapy- and radiotherapy-induced mucositis
Chemotherapy- and radiotherapy-induced nausea and vomiting
Chemotherapy-induced peripheral neuropathy
Chemotherapy-induced thrombocytopenia
Chest pain
Chiari malformation
Chikungunya virus infection
Child abuse
Childhood obesity
Chlamydia trachomatis infection
Cholangiocarcinoma
Choledocholithiasis
Chondrosarcoma
Chordoma
Chronic arthritic pain
Chronic bacterial prostatitis
Chronic cough
Chronic diarrhea
Chronic graft-versus-host disease
Chronic hearing loss
Chronic inflammatory demyelinating polyneuropathy
Chronic intestinal pseudo-obstruction
Chronic kidney disease
Chronic kidney disease-mineral and bone disorder
Chronic limb-threatening ischemia
Chronic lymphocytic leukemia
Chronic mesenteric ischemia
Chronic myeloid leukemia
Chronic obstructive pulmonary disease
Chronic pancreatitis
Chronic pelvic pain in women
Chronic prostatitis/chronic pelvic pain syndrome
Chronic rhinosinusitis
Chronic thromboembolic pulmonary hypertension
Chronic urticaria
Chronic venous insufficiency
Circadian rhythm sleep disorders
Clavicle fracture
Clostridial myonecrosis
Clostridioides difficile infection
Cluster headache
Coarctation of aorta
Coccidioidomycosis
Colon cancer
Colonic ischemia
Colonic volvulus
Colonoscopy
Colorectal polyps
Colorectal surgery
Common cold
Community-acquired pneumonia
Concussion
Congenital adrenal hyperplasia
Congenital dysfibrinogenemia
Congenital hydronephrosis
Congenital hypothyroidism
Congenital muscular torticollis
Congenital nasolacrimal duct obstruction
Congenital penile curvature
Connective tissue disease-associated interstitial lung disease
Constipation
Constitutional mismatch repair deficiency syndrome
Constrictive pericarditis
Contact dermatitis
Contraception
Contrast-enhanced ultrasound of the liver
Contrast-induced nephropathy
Corneal abrasion
Coronary artery disease
Corticosteroid-induced adrenal insufficiency
Corticosteroid-induced osteoporosis
COVID-19 infection
COVID-19-associated pulmonary mucormycosis
Critical illness-related corticosteroid insufficiency
Crohn's disease
Cryptococcal meningitis
Cryptorchidism
Cushing's syndrome
Cutaneous and mucocutaneous leishmaniasis
Cutaneous lupus erythematosus
Cutaneous melanoma
Cutaneous squamous cell carcinoma
Cutaneous warts
Cyanide poisoning
Cyclic vomiting syndrome
Cystic fibrosis
Cystoisosporiasis
Cytomegalovirus infection