My son complained last night that twice during the day yesterday while sitting a this desk he felt like a snake had run down the length of his leg very quickly . He described the sensation like a tickling and somewhat painful sensation. It is important to note that he has been complaining of leg pain in one leg or the other - different areas of his leg - upper and lower for about a year now. We have not mentioned it to his pediatrician and simply wrote it off as growing pains. What prompted my research and question is the snake running down the leg very quickly sensation he experienced yesterday... Is this common? Or is there a reasonable explanation?