In stochastic processes, chaos theory and time series analysis, detrended fluctuation analysis (DFA) is a method for determining the statistical self-affinity of a signal.
Sore throats caused by tonsillitis or streptococcus may trigger a canker sore even after the initial throat condition has subsided. Also known as an aphthous ulcer, canker sores are painful and unsightly, but they are not contagious.
If your canker sore is painful, here are some tips to try: 1  Stay away from spicy foods, acidic foods, and hot foods and beverages to avoid irritating the mouth. 2  Avoid eating food like rough crackers or chips that can scrape your mouth ulcer or mouth tissue.  Hold an ice cube to the canker sore to get pain relief.