| Abbreviations | Meaning |
 | MPS | Hereditary Giant Platelet Syndrome |
| MPS | Meconium Plug Syndrome |
| MPS | Montreal Platelet Syndrome |
| MPS | Myofascial Pain Syndrome |
| MRK | Mayer-Rokitansky-Küster [syndrome] |
| MRKH | Mayer-Rokitansky-Kuster-Hauser Syndrome |
| MRKH | Mayer-Rokitansky-Küster-Hauser [syndrome] |
| MRS | Magnetic Resonance Spectroscopy; Mania Rating Scale; Medical Receiving Station; Medical Record Summary; Melkersson-Rosenthal Syndrome |
| MRSD | Mental Retardation-skeletal Dysplasia [syndrome] |
| MRXA | X-linked Mental Retardation-aphasia Syndrome |
| MRXS | Mental Retardation, X-linked, Syndrome |
| MS | Maffuci Syndrome |
| MS | Marfan Syndrome |
| MS | Marie-Strümpell [syndrome] |
| MS | Meckel Syndrome |
| MS | Menkes Syndrome |
| MSC-LSMS | Mid-systolic Click-late Systolic Murmur Syndrome |
| MSEL | Materials Science And Engineering Laboratory; Myasthenic Syndrome Of Eaton-Lambert |
| MSLS | Marinesco-Sjögren-like Syndrome |
| MSP | Münchausen Syndrome By Proxy |
| MSS | Marinesco-Sjögren Syndrome |
| MSS | Marshall-Smith Syndrome |
| MST | Myeloproliferative Syndrome, Transient |
| MSW | Mallory-Weiss Syndrome |
| MTB | Methylthymol Blue; Michelin Tire Baby [syndrome]; Mycobacterium Tuberculosis |
| MTS | Mohr-Tranebjaerg Syndrome |
| MTSS | Medial Tibial Stress Syndrome |
| MUS | Mouse Urologic Syndrome; Muscinol |
| MVP-SC | Mitral Valve Prolapse-systolic Click [syndrome] |
| MVPS | Medicare Volume Performance Standards; Mitral Valve Prolapse Syndrome |
| MW | Mallory-Weiss [syndrome] |
| MW | Minot-von Willebrand [syndrome] |
| MWS | Marden-Walker Syndrome; Moersch-Woltman Syndrome |
| NADR | National Acquired Immunodeficiency Syndrome [AIDS] Demonstration Research; Noradrenalin |
| NAME | National Association Of Medical Examiners; Nevi, Atrial Myxoma, Myxoid Neurofibroma, Ephelides [syndrome] |
| NARES | Nonallergic Rhinitis-eosinophilia Syndrome |
| NARP | Neuropathy-ataxia-retinitis Pigmentosa [syndrome] |
| NAS | Neonatal Airleak Syndrome |
| NAS | Neuroallergic Syndrome |
| NB | Neuro-Behcet [syndrome] |
| NBCCS | Nevoid Basal Cell Carcinoma Syndrome |
| NBS | Nevoid Basal Cell Carcinoma Syndrome |
| NBS | Nijmegen Breakage Syndrome |
| NBS | Nystagmus Blockage Syndrome |
| NCS | Neurocutaneous Syndrome |
| NCS | Nystagmus Compensation Syndrome |
| NES | Night Eating Syndrome; Not Elsewhere Specified |
| NFDR | Neurofaciodigitorenal [syndrome] |
| NFJ | Naegeli-Franceschetti-Jadassohn [syndrome] |
| NFNS, NF-NS | Neurofibromatosis-Noonan Syndrome |
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