China 
Africa 
- Brain-specific angiogenesis inhibitor
- Brain-specific angiogenesis inhibitor 1
- BrainGate
- Braincase
- Brainport
- Brainstem
- Brainstem glioma
- Brainwashing
- Brainwave entrainment
- Branaplam
- Branch retinal artery occlusion
- Branch retinal vein occlusion
- Branched chain amino acid aminotransferase
- Branched polymers
- Branchial apparatus
- Branchial cleft
- Branchial cleft cyst
- Branching morphogenesis
- Branchio oto renal syndrome
- Branchio-oculo-facial syndrome
- Branchio-oto-renal syndrome
- Branchiootorenal syndrome
- Brassica napus
- Brassicasterol
- Brassinosteroids
- Braun's lipoprotein
- Braxton Hicks contractions
- Brazil nuts
- Brazilin
- Breadfruit
- Breakage fusion bridge cycle
- Breakage-fusion-bridge cycle
- Breaking point
- Breakthrough bleeding
- Breakthrough infection
- Breakthrough pain
- Breakthrough therapy
- Breast
- Breast Imaging-Reporting and Data System
- Breast abscess
- Breast atrophy
- Breast augmentation
- Breast biopsy
- Breast cancer
- Breast cancer chemotherapy
- Breast cancer classification
- Breast cancer management
- Breast cancer prevention
- Breast cancer resistance protein
- Breast cancer screening
- Breast cancer stem cells
- Breast carcinoma
- Breast density
- Breast development
- Breast disease
- Breast engorgement
- Breast enlargement
- Breast examination
- Breast fibroadenoma
- Breast hyperplasia
- Breast hypertrophy
- Breast hypoplasia
- Breast imaging
- Breast implants
- Breast lumps
- Breast milk
- Breast prostheses
- Breast ptosis
- Breast pump
- Breast reconstruction
- Breast reduction
- Breast screening
- Breast self-examination
- Breast surgery
- Breast tension
- Breast ultrasound
- Breast-conservation therapy
- Breast-conserving surgery
- Breastfeeding
- Breastfeeding difficulties
- Breastfeeding in public
- Breastfeeding promotion
- Breath analysis
- Breath carbon monoxide
- Breath holding
- Breath sounds
- Breath test
- Breath tests
- Breathalyzer
- Breathing
- Breathing circuit
- Breathing disorder
- Breathing exercises
- Breathing gas
- Breathing rate
- Breathing system
- Breech birth
- Breech presentation
- Breeding
- Brefeldin A
- Bregma
- Bremelanotide
- Brenner tumor
- Brenneria
- Brentuximab vedotin
- Breslow's depth
- Bretazenil
- Bretylium
- Bretylium tosylate
- Brevetoxin
- Brevibacterium
- Brevifolin
- Brevundimonas
- Brexanolone
- Brexpiprazole
- Briakinumab
- Bridge
- Bridge therapy
- Brief psychotherapy
- Brief psychotic disorder
- Brief therapy
- Brigatinib
- Bright's disease
- Brill-Zinsser disease
- Brilliant cresyl blue
- Brillouin scattering
- Brimonidine
- Brincidofovir
- Brine
- Brineura
- Brinzolamide
- Bristle
- Bristol Stool Scale
- Bristol stool scale
- British Doctors Study
- British Pharmacopoeia
- British birth cohort studies
- Brittle asthma
- Brivanib
- Brivaracetam
- Brivudine
- Brix
- Broad ligament
- Broad spectrum antibiotics
- Broad-spectrum antibiotics
- Broad-spectrum antiviral drugs
- Broad-spectrum therapeutic
- Broca's area
- Brodalumab
- Brodifacoum