Nutrition basics
Learning Center
Birthmarks
Learn to identify types of birthmarks by how the skin looks. Examples include café au lait spot, congenital nevus, port-wine stain and hemangioma.
Bladder cancer
Blood in the urine (hematuria) sometimes is a sign of bladder cancer. Learn about other bladder cancer signs and symptoms and explore treatment options.
Bladder infection in men
Although women are more likely to get bladder infections, men can get them, too. Learn about signs and symptoms and what could put you at risk.
Bladder outlet obstruction: Causes in men?
Find out more about the causes of male bladder outlet obstruction and possible next steps.
Blighted ovum: What causes it?
A Mayo Clinic specialist explains what's behind this type of early pregnancy loss.
Blood in semen
Finding blood in your semen can be alarming, but the cause is usually benign. Find out possible causes and when to see a doctor.
Blood pressure readings: Why higher at home?
Blood pressure that consistently measures higher outside a medical office is called masked hypertension.
Blood pressure: Does it have a daily pattern?
Like many body functions, blood pressure has a daily pattern. Find out more.
Brain tumor
Find out more about the different types, signs, symptoms and causes of brain tumors, which are growths of cells in the brain.
Breastfeeding and alcohol: Is it OK to drink?
Breastfeeding and alcohol don't mix well. A Mayo Clinic specialist discusses how alcohol affects breast milk.
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