Harrison's Manual of Medicine
- labyrinthine dysfunction
- labyrinthitis
- lactose hydrogen breath test
- lacunar syndromes
- laminectomy, decompressive
- lanreotide autogel, for acromegaly
- larva migrans
- laryngeal palsy
- laryngitis
- laser therapy, for esophageal carcinoma
- L-asparaginase, for ALL
- Lassa fever
- laterocollis
- Laurence-Moon-Biedl syndrome
- lead-time bias
- ledipasvir, for hepatitis C
- leech infestation
- left ventricular hypertrophy
- Legionnaires' disease
- leiomyoma
- Lemierre's syndrome
- length bias
- lenvatinib, for hepatocellular carcinoma
- leptomeningeal metastasis
- Leriche syndrome
- letrozole, for breast cancer
- leukapheresis
- leukemoid reaction
- leukocytosis
- leukoerythroblastic reaction
- leukopenia
- leuprolide, for prostate cancer
- levodopa, for Parkinson's disease
- levorphanol, for pain
- Lhermitte's symptom
- lice, human
- lichenification
- lichen simplex chronicus
- Liddle's syndrome
- Li-Fraumeni syndrome
- light chain deposition disease
- lightheadedness
- limb dystonia
- limb-girdle dystrophy
- limbic encephalitis, paraneoplastic
- linaclotide, for irritable bowel syndrome
- linagliptin, for diabetes mellitus
- linear skin lesion
- linitis plastica
- liothyronine, for thyroid neoplasms
- lipase, serum
- lipemia retinalis
- lipoma, small-bowel
- liquid nitrogen, for warts
- listerial infections
- liver biopsy, percutaneous
- liver flap
- liver function tests
- lixisenatide, for diabetes mellitus
- Loa loa
- lockjaw (trismus)
- lofexidine, for narcotic withdrawal
- Löffler's syndrome
- Löfgren's syndrome
- lomitapide, for dyslipidemia
- lorcaserin
- louse-borne relapsing fever
- lovastatin, for dyslipidemia
- low back strain/sprain
- lower esophageal sphincter, disorders of
- loxapine
- LSD (D-lysergic acid diethylamide)
- lubiprostone, for irritable bowel syndrome
- lumbar disk disease, back pain in
- lumpectomy
- lung biopsy
- lung flukes
- lung volume reduction surgery
- lupus, drug-related
- lupus pernio
- lymphadenitis, in tuberculosis
- lymphangiectasia, intestinal
- lymphedema
- lymphocytic leukemia, chronic: see chronic lymphocytic leukemia
- lymphocytosis
- lymphoepithelioma
- lymphopenia
- lymphoproliferative disease, Epstein-Barr virus