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Lactose intolerance
Not being able to fully digest the sugar (lactose) in milk can lead to diarrhea, gas and bloating after eating or drinking dairy products.
Laryngitis
Learn about the symptoms, causes and treatment for this common irritation of the voice box.
Lipoma
Lipoma — Comprehensive overview covers symptoms, causes, treatment of this usually harmless fatty tumor that tends to show up in middle age.
Measles
Learn about this vaccine-preventable disease that used to be common in childhood and is well known for a characteristic red, splotchy rash and high fever.
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Milk allergy
Find out what happens when the immune system reacts to proteins in milk, causing allergic signs and symptoms such as hives and wheezing.
Mixed connective tissue disease
Mixed connective tissue disease has signs and symptoms of multiple disorders, making it difficult to diagnose. There's no cure, but medications can help.
Molluscum contagiosum
Learn how to prevent and treat this common skin infection that affects people of all ages.
Mumps
Find out more about the symptoms and treatment of this viral illness and how vaccines can prevent it.
Muscular dystrophy
Read about different types of this progressive disease that interferes with the creation of new muscle, as well as treatments to help with symptoms.
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