- lazy eye
- leg motor restlessness
- legionnaires disease
- leishmaniasis
- leprosy
- leukaemia
- leukemia
- leukemic cutaneous t cell lymphoma
- listeria
- liver cancer
- liver failure
- liver function
- liver injury
- liver transplant
- long qt syndrome
- lou gehrig's disease
- low birth weight
- lung cancer
- lung damage
- lung fibrosis
- lung injury
- lung tumors
- lupus nephritis
- lyme disease
- lymphangiomatosis
- lymphoma
- lynch syndrome
- lysosomal storage disease
