Gauff provides an update on the state of her left arm at the Miami Open.

Heart disease remains the leading cause of death in the U.S. Left arm pain during a heart attack is common due to shared nerve pathways with the heart. Chest discomfort is a key heart attack symptom.

When it comes to vaccines, where they go into your body can make a surprising difference in how well they work. Scientists in Sydney have uncovered how getting a booster shot in the same arm as your ...