STAIND's AARON LEWIS Passes Kidney Stone Less Than Week After Having His Appendix Removed

STAIND frontman Aaron Lewis passed a kidney stone earlier today (Tuesday, January 18) -- less than a week after having his appendix removed. Kidney stones, which are hardened or calcified deposits of certain minerals, salts, and other materials, develop in the kidneys themselves before traveling through the ureter and into the bladder, where they are ultimately passed from the body in the urine. Lewis shared the news of his kidney stone in an Instagram post. He wrote: "Laying here recovering fro...