Harrison's Manual of Medicine
- MAC (Mycobacterium avium complex) infections
- Machupo/Bolivian hemorrhagic fever
- macitentan, for pulmonary hypertension
- maculatum disease
- magnesium citrate, for constipation
- magnetic resonance angiography (MRA), in stroke
- Malassezia infections
- malathion, for pediculiasis
- maldigestion
- male gender, cardiovascular disease and
- male reproductive system disorders
- malingering
- MALT lymphoma: see mucosa-associated lymphoid tissue lymphoma
- mandibular repositioning device
- mania
- mantle cell lymphoma
- maprotiline
- maraviroc, for HIV infection
- Marburg virus infection
- march hemoglobinuria
- Marfan's syndrome
- marine poisoning
- massage, for chronic back pain
- mastitis
- mastoiditis
- McArdle's disease
- M component
- MCTD (mixed connective tissue disease)
- MDR (multidrug-resistant) tuberculosis
- measles (rubeola)
- measles immunoglobulin
- measles inclusion-body encephalitis (MIBE)
- mediastinal mass
- mediastinitis
- mediastinitis, fibrosing
- medicinal leech
- medulloblastomas
- megakaryoblastic leukemia
- meglumine antimonate, for leishmaniasis
- Meige's syndrome
- melarsoprol, for sleeping sickness
- melasma
- melena
- memantine, for Alzheimer's disease
- membranoproliferative glomerulonephritis (MPGN)
- membranous glomerulonephritis
- Ménière's disease
- meningeal syphilis
- meningococcemia
- meningoencephalitis, listerial
- meningovascular syphilis
- mental status exam
- meralgia paresthetica
- merozoite
- MERS-CoV (Middle East respiratory syndrome coronavirus)
- mesalamine enema, for inflammatory bowel disease
- mesenchymal tumors
- mesenteric insufficiency, chronic
- mesenteric ischemia
- mesothelioma
- metabolism, of food
- methamphetamine
- methemoglobinemia
- methenamine, for nephrolithiasis
- methimazole, for thyrotoxicosis
- methylcellulose, for irritable bowel syndrome
- methyldopa, for hypertension
- MGUS (monoclonal gammopathy of uncertain significance)
- MIBE (measles inclusion-body encephalitis)
- miconazole, for candidiasis
- micrographia
- micronutrient deficiency
- microscopic polyangiitis
- Microsporidia
- Middle East respiratory syndrome coronavirus (MERS-CoV)
- midsystolic click (heart sound)
- mifepristone, for emergency contraception
- miglitol, for diabetes mellitus
- migrating motor complex
- miliary disease
- milk alkali syndrome
- milnacipran, for fibromyalgia
- miltefosine, for leishmaniasis
- Milwaukee shoulder
- mineral deficiencies
- mineral oil, for constipation
- minimal change disease
- Mini-Mental status examination
- minitransplant
- Minnesota tube, for esophagogastric varices
- mipomersen, for dyslipidemia
- misoprostol, for erosive gastropathies
- mitiglinide, for diabetes mellitus
- mitochondrial myopathies
- mitomycin, for anal cancer
- mitoxantrone, for prostate cancer
- mittelschmerz
- mixed connective tissue disease (MCTD)
- MM (mononeuropathy multiplex)
- MMCB (multifocal motor neuropathy with conduction block)
- Mohs micrographic surgery
- molindone
- Mollaret's meningitis
- monoamine oxidase-B (MAO-B) inhibitors, for Parkinson's disease
- monoclonal gammopathy of uncertain significance (MGUS)
- monoclonal immunoglobulins, renal disease and
- monocytic leukemia
- monocytopenia
- monocytosis
- mononeuritis multiplex
- mononeuropathy multiplex (MM)
- monoparesis
- mood disorders
- MOPP-ABV regimen, for Hodgkin's disease
- MOPP regimen, for Hodgkin's disease
- Moraxella catarrhalis infections
- morbilliform lesion
- Morganella infections
- mortality, age-specific
- motor examination
- motor fluctuations
- motor unit disorders
- MPGN (membranoproliferative glomerulonephritis)
- MRA (magnetic resonance angiography), in stroke
- MRSA infections: see methicillin-resistant S. aureus infections
- MS: see mitral stenosis; multiple sclerosis
- MSA (multiple system atrophy)
- MTP inhibitor
- mucormycosis
- mucosal leishmaniasis
- mucous membranes, dry
- mucous patch
- multidrug-resistant (MDR) tuberculosis
- multifocal motor neuropathy with conduction block (MMCB)
- multi-infarct dementia
- multiorgan system failure
- multiple cranial nerve palsies
- multiple system atrophy (MSA)
- Munchausen's syndrome
- Murphy's sign
- muscle contracture
- muscle cramp
- mushrooms, poisonous
- M-VAC regimen, for bladder cancer
- myalgia
- myasthenic crisis
- mycetoma
- Mycobacterium avium complex (MAC) infections
- Mycoplasma pneumoniae infections
- myelitis, paraneoplastic
- myeloblastic leukemia
- myelomonocytic leukemia
- MYH-associated polyposis
- myiasis
- myocardial ischemia
- myophosphorylase deficiency
- myotonia
- myotonic dystrophy
- myxedema coma