By the way, doctor: What is the cause of my sudden leg weakness?

Q. When I walk for about a mile, my leg muscles suddenly get very weak — so weak I can hardly walk. After 10–15 minutes of rest, the muscles go back to normal and I can continue for another mile or so. I am trying magnesium pills. Can you think of anything that might be causing this sudden weakness?

A. There are many problems for which I would suggest that you try a home remedy or a particular exercise and call your doctor only if they don't work. But this is not one of them. Your symptoms could be the result of several potentially serious conditions.

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »