Breast cancer can affect anyone. Learn about the signs and symptoms of this cancer. Treatment most often involves surgery.
Disease
Male hypogonadism
This condition affects the ability of men's bodies to produce enough testosterone or enough sperm or both.
Disease
Male infertility
Male infertility often plays a role when couples have trouble conceiving. Find out what causes male infertility and available options for treatment.
Disease
Malignant hyperthermia
This rare genetic disorder triggers a severe reaction to certain anesthesia drugs, causing rigid muscles, high fever, fast heart rate and rapid breathing.
Disease
Malignant peripheral nerve sheath tumors
These cancers form in the linings of nerves. Treatment includes surgery, radiation therapy and, sometimes, chemotherapy.
Disease
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.
Disease
Mantle cell lymphoma
Find out more about the symptoms, diagnosis and treatment of this type of non-Hodgkin lymphoma.
Disease
Marfan syndrome
This inherited disorder affects the skeleton and the eyes. It can also harm the large blood vessel that carries blood from the heart to the rest of the body.
Disease
Mastitis
Pain and swelling in the breast could be caused by this breast condition. Find out about symptoms, treatment and self-care.
Disease
Measles
Learn about this vaccine-preventable disease that once was common in childhood and is known for a splotchy rash and high fever.
Disease
Median arcuate ligament syndrome (MALS)
Stomach pain after eating isn't always indigestion. It could be MALS, also called celiac artery compression. Know the warning symptoms.
Disease
Medication overuse headaches
Using medicines that ease headache pain too often can start causing headaches. Learn about prevention and treatment.