Men's sexual health
Learning Center
Tumor vs. cyst: What's the difference?
A Mayo Clinic expert explains the differences and similarities between these two types of growths and how doctors determine if they're cancerous.
Thyroid peroxidase antibody test: What is it?
A thyroid peroxidase antibody test can help determine the cause of thyroid disease.
Testosterone therapy: Potential benefits and risks as you age
Testosterone therapy — Explore the potential benefits and risks of increasing your testosterone level.
Testicular exam
Examining your testicles regularly can help you notice changes when they occur and identify testicular problems.
Terrible twos: Why are 2-year-olds so difficult?
Find out how to help your toddler meet the challenges of being 2.
Stuttering
Stuttering, sometimes called stammering, is a speech condition that involves problems with rhythm and flow when speaking.
Stress test
This test gives important information about your heart health. Know how to prepare and what to expect.
Stool DNA test
Learn about this noninvasive colon cancer screening test that can detect DNA changes in cells collected from a stool sample.
Small cell, large cell cancer: What this means
Cancer cells are classified by how they look under a microscope. Learn common terms used to describe cancer cells.
Slide show: Blood sugar testing
Blood sugar testing is an essential part of diabetes care. See how it's done.
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