By Name

Malaria

Male Infertility

Male-pattern Baldness -- See Hair Loss

Malignant Tumor -- See Cancer

Mallet Finger

Manic-depressive Disorder -- See Bipolar Disorder

Marijuana Use

Mass Psychogenic Illness

Mastitis

Mastocytosis

Meckel's Diverticulum

Melanoma -- See Skin Cancer

Melasma

Meniere’s Disease

Meningitis

Menopause

Menorrhagia -- See Abnormal Uterine Bleeding

Menstrual Cramps -- See Dysmenorrhea

Metabolic Syndrome

Methicillin-resistant Staphylococcus aureus (MRSA)

Microscopic Hematuria

Migraines

Miscarriage -- See Bleeding in Early Pregnancy

Mitral Valve Prolapse

Mononucleosis

Morning Sickness

Multiple Myeloma

Multiple Sclerosis

Mumps

Munchausen by Proxy Syndrome

Mushroom Poisoning -- See Food Poisoning

Myocardial Infarction -- See Heart Attack