- Lacrimal Duct Obstruction
- Lactation Disorders
- Lactose Intolerance
- Landau-Kleffner Syndrome
- Langer-Giedion Syndrome
- Larsen Syndrome
- Larva Migrans
- Laryngeal Neoplasms
- Laryngomalacia
- Lassa Fever
- Laurence-Moon-Biedl Syndrome
- Leber’s Hereditary Optic Neuropathy
- Leg Ulcer
- Legg-Perthes Disease
- Legionellosis
- Leigh Disease