China 
Africa 
- Buformin
- Bufotalin
- Bufotenin
- Bufotenine
- Bufuralol
- Bulb of penis
- Bulbar palsy
- Bulbocavernosus muscle
- Bulbocavernosus reflex
- Bulbospongiosus
- Bulbospongiosus muscle
- Bulbourethral gland
- Bulbus cordis
- Bulging flanks
- Bulgur
- Bulimia
- Bulimia nervosa
- Bulk density
- Bulking agent
- Bull's eye maculopathy
- Bullatacin
- Bullectomy
- Bulleidia
- Bullous impetigo
- Bullous keratopathy
- Bullous pemphigoid
- Bullying
- Bullying in nursing
- Bumetanide
- Bun-to-creatinine ratio
- Bundibugyo ebolavirus
- Bundle branch
- Bundle branch block
- Bungarotoxin
- Bunionectomy
- Bunionette
- Bunions
- Bunsen burner
- Bunyaviridae
- Buparlisib
- Buphedrone
- Buphthalmos
- Bupivacaine
- Buprenorphine
- Bupropion
- Burette
- Buried bumper syndrome
- Buried penis
- Burimamide
- Burkholderia
- Burkholderia cenocepacia
- Burkholderia cepacia
- Burkholderia cepacia complex
- Burkholderia gladioli
- Burkholderia mallei
- Burkholderia multivorans
- Burkholderia pseudomallei
- Burkholderia vietnamiensis
- Burkitt lymphoma
- Burkitt's lymphoma
- Burn center
- Burn pits
- Burn scar contracture
- Burning feet syndrome
- Burning mouth syndrome
- Burning sensation
- Burnout
- Burnout syndrome
- Burns
- Burosumab
- Burow's solution
- Bursae
- Bursectomy
- Bursitis
- Burst lobe
- Burst suppression
- Buruli ulcer
- Buscopan
- Buserelin
- Business case
- Buspirone
- Buss-Perry Aggression Questionnaire
- Busulfan
- Butaclamol
- Butadiene
- Butalbital
- Butane
- Butanethiol
- Butanol
- Butanone
- Butenafine
- Butene
- Buthionine sulfoximine
- Butoconazole
- Butorphanol
- Butorphanol tartrate
- Butoxamine
- Butter
- Butterflies in the stomach
- Buttock
- Buttock augmentation
- Butyl methacrylate
- Butyl paraben
- Butyl rubber
- Butylated hydroxyanisole
- Butylated hydroxytoluene
- Butylone
- Butylphthalide
- Butylscopolamine
- Butyraldehyde
- Butyrate
- Butyrivibrio
- Butyrivibrio fibrisolvens
- Butyrophenone
- Butyrophilin
- Butyrylcholine
- Butyrylcholinesterase
- BxPC-3
- By mouth
- Bypass graft
- Bypass surgery
- Byssinosis
- Bystander effect
- C banding
- C fibers
- C value
- C-Jun N-terminal kinases
- C-Met inhibitors
- C-fos
- C-jun n-terminal kinases
- C-met
- C-peptide
- C-raf
- C-reactive protein
- C-terminal
- C-terminal telopeptide
- C-terminus
- C-type lectins
- C-value
- C1 complex
- C1 domain
- C1-inhibitor
- C1-inhibitor deficiency
- C16
- C1R
- C1q
- C1s
- C2
- C2 domain
- C3