Third trimester
Learning Center
Narcolepsy
Learn more about this sleep disorder that causes periods of involuntary sleep, sleep paralysis and early rapid eye movement (REM) sleep.
Mononucleosis and Epstein-Barr: What's the connection?
The Epstein-Barr virus sometimes causes a disease known as mono. Learn who is at risk and what the symptoms are.
Monoclonal gammopathy of undetermined significance (MGUS)
When bone marrow produces an unusual protein in the blood, it can sometimes lead to certain types of blood cancer.
Mold allergy
Coughing, sneezing and itchy eyes often accompany this common allergy. Find out how to treat this condition and help keep it under control.
Molar pregnancy
This rare pregnancy complication requires early treatment. Learn more about diagnosis and treatment of this type of pregnancy loss.
Migraines: Are they triggered by weather changes?
Migraines — Are they triggered by weather changes?
Medications and supplements that can raise your blood pressure
Certain medicines and herbal remedies, including those used to treat pain, depression and the common cold, can increase blood pressure.
Mayo Clinic Minute: Women and Alzheimer's Disease
Researchers are working to figure out why more women have Alzheimer's disease than men.
Mayo Clinic Minute: Why the risk of frostbite is greater than you think
Learn why the risk of frostbite is greater than you think.
Mayo Clinic Minute: Why concussion screening is important
Concussion screening can help determine when athletes can return to play.
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