Stress basics
Learning Center
Chronic stress puts your health at risk
Your body's stress reaction was meant to protect you. But when it's always on alert, your health can pay the price.
Stress symptoms: Effects on your body and behavior
Learn how stress symptoms can affect your health so that you can take action.
Ankylosing spondylitis
Learn about this inflammatory disease that can cause some of the vertebrae in the spine to fuse over time.
Stress and hair loss: Are they related?
Learn how stress and hair loss can be related.
Feminizing surgery
Find out how feminizing surgical procedures can help better align the body with a person's gender identity.
Different types of COVID-19 vaccines: How they work
Find out how different COVID-19 vaccines cause your body to create antibodies that will fight the COVID-19 virus.
Masculinizing surgery
Find out how masculinizing surgical procedures can help better align the body with a person's gender identity.
Multiple sclerosis
This nervous system disorder causes a range of symptoms — and while there's no cure, it's possible to have long periods of remission.
Blood donation
Find out what to expect during blood donation and how your blood will be used to help others.