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.
There are a number of possible canker sore causes, but nothing is certain. Stress could be causing your canker sores. Eating crunchy foods or foods with sharp edges, like chips, and spicy foods can be the cause of canker sores as well. Even nutritional deficiencies have been attributed to recurring canker sores.