- B12 deficiency
- Babies crying
- Babies, weaning
- Back pain
- Bacterial vaginosis
- Bad breath
- Baker's cyst
- Balanitis
- Barium enema
- Bartholin's cyst
- Bed sores
- Bedwetting
- Behcet's disease
- Bell's palsy
- Bends
- Beta blockers
- Bicarbonate
- Bile duct cancer
- Bilharzia
- Binge eating
- Biopsy
- Bipolar disorder
- Bird flu
- Birth control
- Birthmarks
- Bites, human and animal
- Bites, insect
- Bites, snake
- Bladder cancer
- Bladder stones
- Bleeding gums
- Blepharitis
- Blindness
- Blisters
- Blood clot
- Blood donation
- Blood groups
- Blood poisoning
- Blood pressure (high)
- Blood pressure (low)
- Blood tests
- Blood transfusion
- Blushing
- Body odour
- Body piercing
- Boils
- Bone cancer (sarcoma)
- Bone cyst
- Bone densitometry scan
- Bone marrow donation
- Bone marrow transplant
- Bottle feeding
- Botulism
- Bowel cancer
- Bowel transplant
- Brain abscess
- Brain death
- Brain haemorrhage
- Brain tumour
- Breast abscess
- Breast cancer (female)
- Breast cancer (male)
- Breast implants
- Breast lump
- Breast pain, cyclical
- Breast reduction
- Breastfeeding
- Brittle bones
- Broken bones
- Bromodosis (smelly feet)
- Bronchiectasis
- Bronchiolitis
- Bronchitis
- Bronchodilator drugs
- BSE
- Bulimia
- Bunion
- Burns and scalds
- Bursitis