Hello @fue and welcome to Mayo Clinic Connect. You ask a good question; one that I thought would be best addressed by members in an existing discussion on Peripheral Neuropathy and Benign Fasciculation Syndrome. You will notice that I have moved your post into this discussion so you can more easily connect with members like @swats005 and @rivermaya34 who have shared about fasciculations as well.

While we wait for members to join how long were you experiencing your symptoms in your lower leg before you noticed them in your upper leg and torso?