Malaria
Male breast cancer
Male hypogonadism
Male infertility
Mammary duct ectasia
Marfan syndrome
Mastitis
Measles
Melanoma
Melanoma under a nail
Membranous nephropathy
Meniere's disease
Meningioma
Meningitis
Menopause
Menstrual cramps
Merkel cell carcinoma
Mesenteric lymphadenitis
mesothelioma
Metabolic syndrome
Metatarsalgia
Microcephaly
Microscopic polyangiitis
Migraine
Mild cognitive impairment (MCI)
Milia
Milk allergy
Miscarriage
Miscarriage threatened
Mitral regurgitation acute
Mitral regurgitation chronic
Mitral stenosis
Mitral valve prolapse
Mixed connective tissue disease
Molar pregnancy
Mold allergy
Moles
Molluscum contagiosum
Monoclonal gammopathy of undetermined significance
Mononeuropathy
Mononucleosis
Morning sickness
Morphea
Morton's neuroma
Mosquito bites
Mouth cancer
MRSA infection
Multiple myeloma
Multiple sclerosis
Multiple system atrophy (MSA)
Mumps
Muscle twitching or thrashing
Muscular dystrophy
Muscular dystrophy, fascioscapulohumeral
Muscular dystrophy, myotonic
Muscular dystrophy, oculopharyngeal
Myelodysplastic syndromes
Myelofibrosis
Myelomeningocele
Myocardial ischemia
Myocarditis
Myoclonus
Myofascial pain syndrome