- COVID-19 Long COVID topics
- Lactose intolerance
- Laryngitis
- Lazy eye
- Legionellosis
- Legionnaires’ disease
- Leptospirosis
- Leukaemia
- LGBTQI topics
- Lipoedema
- Lipoma
- Liquorice
- Listeria
- Listeria and pregnancy
- Liver cancer – primary
- Liver disease
- Liver function tests (LFT) – basics
- Liver function tests (LFT) – in-depth information
- Loneliness
- Long QT syndrome
- Low blood glucose
- Low blood pressure
- Low iron levels
- Lumbar puncture
- Lump in the throat
- Lung cancer
- Lupus
- Lymphoedema