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Klinefelter syndrome
This genetic disorder occurs when a male is born with an extra copy of the X chromosome and may result in low testosterone production and infertility.
Low sperm count
Having a low sperm count can make conceiving a child difficult, but not necessarily impossible. Learn about possible causes and treatment.
Male breast cancer
Breast cancer can affect anyone. Learn about the signs and symptoms of this cancer. Treatment most often involves surgery.
Male hypogonadism
This condition affects the ability of men's bodies to produce enough testosterone or enough sperm or both.
Male infertility
Male infertility often plays a role when couples have trouble conceiving. Find out what causes male infertility and available options for treatment.
Mammary duct ectasia
Mammary duct ectasia is a noncancerous breast condition that affects the milk ducts. Learn the signs and symptoms and when treatment might be needed.
Mild cognitive impairment (MCI)
Learn more about this stage between the typical cognitive decline of aging and the more serious decline of dementia.
Molar pregnancy
This rare pregnancy complication requires early treatment. Learn more about diagnosis and treatment of this type of pregnancy loss.
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.
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.
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