Mats on cats can be very painful, especially if they are tight and close to the skin. Mats can cause discomfort and irritation, leading to skin inflammation, infections, and even open sores. Additionally, the pulling and tugging sensation of a mat can cause your cat to experience pain and distress, which can make them more sensitive to touch and grooming in the future. Therefore, it is important to take prompt action to address matting in cats and prevent it from becoming a source of pain and discomfort for them.