Category ratings defined. Test instruments are rated on their ability to withstand a voltage spike, which is applied through a specified level of resistance (Table). The ratings are broken down by categories â CAT I, II, III, and IV.
Burning Mouth and Tongue. Burning tongue is an odd sensation in the tongue and mouth that most commonly affects women who are entering or going through menopause. Though researchers are not sure what causes it, several suspects include irritating dentures, nerve damage, or hormonal imbalances.
A chemical burn can cause symptoms ranging from burning and blisters to pain and shortness of breath. Burns caused by heat are called thermal burns and can cause pain swelling, skin changes, blisters and more. A thermal burn of the mouth or tongue can cause pain, blisters, peeling skin, and temporary loss of taste. Salivary duct obstruction can lead to swelling and pain, often under the tongue or jaw.