- Labyrinthitis
- Lacrimal Disorders (Dry Eye Syndrome)
- Lactate Dehydrogenase Elevation (algorithm)
- Lactation and Lactation Suppression
- Lactose Intolerance
- Laryngeal Cancer
- Laryngitis
- Laxative Abuse
- Lead Poisoning
- Lead Toxicity, Diagnosis and Treatment (Adult) (algorithm)
- Legg-Calvé-Perthes Disease
- Legionnaires' Disease
- Leishmaniasis
- Lentigo and Freckles (Ephelides)
- Leprosy
- Leptospirosis
- Leriche Syndrome
- Lesbian Health
- Leukemia, Acute Lymphoblastic (ALL) in Adults
- Leukemia, Acute Myeloid
- Leukemia, Chronic Lymphocytic
- Leukemia, Chronic Myelogenous
- Leukoplakia, Oral
- Lichen Planus
- Lichen Sclerosus
- Lichen Simplex Chronicus
- Liddle Syndrome (Pseudoaldosteronism)
- Linear Immunoglobulin A Dermatosis
- Lipoma
- Listeriosis
- Loin Pain/Hematuria Syndrome
- Long QT Interval
- Low Back Pain, Acute (algorithm)
- Low Back Pain, Chronic (algorithm)
- Lower Extremity (Leg) Ulcer (algorithm)
- Lung, Primary Malignancies
- Lung Abscess
- Lupus Erythematosus, Discoid
- Lupus Erythematosus, Systemic (SLE)
- Lupus Nephritis
- Lyme Disease
- Lymphadenopathy (algorithm)
- Lymphangitis
- Lymphedema
- Lymphocytic (Autoimmune) Hypophysitis
- Lymphogranuloma Venereum
- Lymphoma, Burkitt
- Lymphopenia or Lymphocytopenia (algorithm)
5-Minute Clinical Consult