Diagnosaurus
- Babesiosis
- Back pain, low
- Back pain and fever
- Back pain and weight loss
- Bacteremia
- Bacterial overgrowth, intestinal
- Balance, lack of
- Baldness
- Bartholin's cyst or abscess
- Basal cell carcinoma
- Bedsores
- Behçet's syndrome
- Belching
- Bell's palsy
- Benign positioning vertigo
- Benign prostatic hyperplasia
- Berger's disease
- Beta blocker overdose
- Biliary cirrhosis
- Biliary obstruction
- Bilirubin increased
- Bipolar disorder
- Bitemporal hemianopsia
- Bladder, neurogenic
- Bladder cancer
- Bleeding, general approach
- Blepharitis
- Blindness, acute
- Blindness, chronic
- Blindness, fleeting
- Blistering diseases
- Blood pressure, elevated
- Blurry vision, acute
- Blurry vision, chronic
- Boils
- Bone, avascular necrosis
- Bone density, decreased
- Bone metastases
- Bone pain
- Bone tumors
- BOOP
- Botulism
- BPH
- Brachial plexus neuropathy
- Bradycardia
- Bradycardia, relative
- Brain abscess
- Brain mass in HIV/AIDS
- 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
- Breast lump or mass
- Breast pain
- Breath, bad
- Bronchial obstruction
- Bronchiectasis
- Bronchiolitis
- Bronchiolitis obliterans
- Bronchitis, acute
- Bronchitis, chronic
- Bronchogenic carcinoma
- Brucellosis
- Bruising, easy
- Bruit
- Budd-Chiari syndrome
- Buerger's disease
- Bulimia nervosa
- Bullae
- Bullous pemphigoid
- BUN increased with normal GFR
- Burping