Capsaicin is found in chile or pepper plants of the Capsicum genus. It causes the burning sensation associated with spicy foods by stimulating vanilloid nerve receptors. Capsaicin is used in "Pepper Spray" as a weapon. It has a number of potential medical uses including topical use on "fever blisters", topical use on certain types of nerve damage, internally as a cancer-fighting agent, and as part of a treatment for osteoarthritis.