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.
How to prevent canker sores. Because there is no clear cut way to tell what causes canker sores, preventing them can be tricky. If you regularly suffer from them, start by looking at your diet. Avoid acidic and spicy foods that can irritate mouth tissues, and also avoid abrasive foods that can damage the mouth.