Severe lower back pain has many possible causes, from muscle strains to spinal conditions. Learn which symptoms mean it's time to see a doctor right away.
Most side effects from radiation don't appear right away. Here's what actually happens after your first treatment and how to take care of yourself early on.
Valve insufficiency means a heart valve doesn't close properly, letting blood flow backward. Learn what causes it, how it's diagnosed, and when treatment is needed.