This article was reviewed by Felix Gussone, MD. Key Takeaways: Your endocrine system regulates many bodily functions, from ...

You’re relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it’s a muscle in your arm, your leg, or your foot that begins to spasm – sometimes for a few seconds, sometimes for ...

When your body lacks vitamin D, it can disrupt several important functions, especially the bones, muscles and immune system.