- bad blood
- bilious fever
- A term loosely applied to certain intestinal and malarial fevers. See Typhus.
- black death
- Bubonic Plague. The scourge of 15th century Europe. Could also mean Typhus.
- black lung
- Disease caused by breathing coal dust.
- An abscess of skin or painful inflammation of the skin or a hair follicle usually caused by a staphylococcal infection. Synonym: furuncle.
- brain fever
- See meningitis, typhus.
- bright's disease
- A disease of the kidney.
- bronchial asthma
- A disorder of breathing, characterized by spasm of the bronchial tubes of the lungs, wheezing, and difficulty in breathing air outward–often accompanied by coughing and a feeling of tightness in the chest.
- bronco- pneumonia
- Pneumonia involving many relatively small areas of lung tissue.
- bubonic plague
- A form of plague passed from the fleas on rats that causes swelling of the lymph nodes. Also called Black Death.