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.
Most sore throats result from viral infections, usually colds, but possibly influenza. In children or adults who were not immunized, the measles, chickenpox or whooping cough can cause a sore throat. Sometimes, a canker sore or fever blister forms in the throat, causing intense pain upon swallowing.