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.
Canker sores, or aphthous ulcers, are the lesions caused by aphthous stomatitis. 1  They may seem like a fairly benign, limited condition, but in the presence of so many other problems that occur with IBD they can be upsetting and painful. Fortunately they are usually harmless and treatment is aimed at reducing discomfort.