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Mucolipidosis I (ML I), or sialidosis, is a rare, inherited disorder in which genetic variations disrupt the normal activity of lysosomes in human cells.

Mucolipidosis II (ML II), or I-cell disease, is a rare, inherited disorder in which genetic variations disrupt the normal activity of lysosomes in human cells.

Midaortic syndrome is a very rare condition in which part of the aorta that runs through the chest and abdomen narrows.

A milk allergy is an abnormal response of the body to the proteins found in cows’ milk.

Mitral valve stenosis happens when the mitral valve is too narrow, causing blood to back up in the heart’s left atrium.

The most common cause for menstrual irregularities is when a woman's ovaries don't release an egg.

Mitochondrial disease is not a single disorder but an umbrella term for dozens of individual disorders in which the body’s cells have problems producing energy.

Moyamoya is a rare condition in which the blood vessels (internal carotid arteries) that supply blood to the brain become narrowed.

Multicystic dysplastic kidney is a condition in which the kidney has been essentially replaced by multiple cysts.

Mumps is a very contagious viral illness that usually makes a child have a fever and swollen salivary glands in his mouth and near his ear.