This health concern can make it challenging to start a pregnancy. Learn about possible causes and treatment.
Disease
Lung cancer
Learn about the symptoms, diagnosis and treatment for this deadly form of cancer.
Disease
Male breast cancer
Breast cancer can affect anyone. Learn about the signs and symptoms of this cancer. Treatment most often involves surgery.
Disease
Mantle cell lymphoma
Find out more about the symptoms, diagnosis and treatment of this type of non-Hodgkin lymphoma.
Disease
Menstrual cramps
Menstrual cramps — pain in the lower abdomen just before or during menstrual periods — can range from mild to severe. Learn about treatment options.
Disease
Merkel cell carcinoma
Learn about this skin cancer that grows quickly. Find out about symptoms, diagnosis and treatments, including Mohs surgery, radiation and immunotherapy.
Disease
Metastatic (stage 4) prostate cancer
Find out about diagnosis and treatment of this cancer that has spread to the lymph nodes or other parts of the body.
Disease
Metastatic castration-resistant prostate cancer (mCRPC)
Learn about treatments for prostate cancer that no longer responds to hormone therapy. Options include chemotherapy, radiopharmaceutical therapy and others.
Disease
Microscopic colitis
Ongoing, watery diarrhea could be a sign of this condition of the colon. Find out about testing and treatment.
Disease
Mild cognitive impairment (MCI)
Learn more about this stage between the typical memory loss related to aging and the more serious decline of dementia.
Disease
Mixed connective tissue disease
This condition has symptoms of several other conditions, making it hard to diagnose. There's no cure, but medicines can help.
Disease
Molluscum contagiosum
Learn how to prevent and treat this common skin infection that affects people of all ages.