Diagnosaurus
- Babesiosis
- Bacteremia
- Bacterial overgrowth, intestinal
- Baldness
- Bartholin's cyst or abscess
- Basal cell carcinoma
- Bedsores
- Behçet's syndrome
- Bell's palsy
- Benign positioning vertigo
- Benign prostatic hyperplasia
- Berger's disease
- Beta blocker overdose
- Biliary cirrhosis
- Biliary obstruction
- Bipolar disorder
- Bladder, neurogenic
- Bladder cancer
- Bleeding, general approach
- Blepharitis
- Blindness, acute
- Blindness, chronic
- Blindness, fleeting
- Blood pressure, elevated
- Blurry vision, acute
- Blurry vision, chronic
- Boils
- Bone, avascular necrosis
- Bone density, decreased
- Bone metastases
- Bone tumors
- BOOP
- Botulism
- BPH
- Brachial plexus neuropathy
- Brain abscess
- Brain metastases
- Brain tumors (brain mass)
- Breast, fat necrosis
- Breast abscess (mastitis)
- Breast cancer (female)
- Breast cancer (male)
- Breast enlargement, male
- Breast fibroadenoma
- Breast fibrocystic disease
- Bronchial obstruction
- Bronchiectasis
- Bronchiolitis
- Bronchiolitis obliterans
- Bronchitis, chronic
- Bronchogenic carcinoma
- Brucellosis
- Budd-Chiari syndrome
- Buerger's disease
- Bulimia nervosa
- Bullous pemphigoid