Hi there, ! Thanks for your question. It's a common issue for people with MS, often caused by muscle weakness, fatigue, or nerve damage. MS affects the central nervous system, and when nerves that control muscle movement are damaged, it can lead to sensations like heaviness, stiffness, or weakness in the legs. I can't speak from a personal stand point but I wanted to share with you an article from one of our contributors who speaks about their experience with this same issue. I think you might find it useful- https://multiplesclerosis.net/living-with-ms/what-does-leg-weakness-feel-like. In the meantime, is there anything you are taking or doing help help alleviate this? Have you brought this to your doctors concern? I hope your about to get some resolve and relief soon. Please let us know if there is anything else we can answer for you! Kindly, Latoya (Team Member)