Capsaicin

Capsaicin is the active component of chili peppers, which are plants belonging to the genus Capsicum. It is an irritant for humans, and produces a sensation of burning in any tissue with which it comes into contact. Because of the burning sensation caused when it comes in contact with mucous membranes, it is commonly used in food products to give them added spice or "heat" (pungency). In high concentrations capsaicin will also cause a burning effect on other sensitive areas of skin.

Cold milk is the most effective solution against the burning sensation. if no actions are taken, the burning sensation will slowly fade away in about 6–8 hours. It is common for people to experience pleasurable and even euphoriant effects from eating capsaicin-flavored foods.

Capsaicin is used in many topical ointments used to relieve the pain of peripheral neuropathy (treatment of pain in the nerve endings near the surface of the skin). It may be used as a cream for the temporary relief of minor aches and pains of muscles and joints associated with arthritis, simple backache, strains and sprains. Studies have shown that capsaicin can relieve arthritic symptoms and improve flexibility of the joints.