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.
1 Canker sores are small, painful ulcers on the inside of the mouth, tongue, lips, or throat. 2  Symptoms of canker sores include small, painful, crater-like ulcers.3  See a doctor if canker sores are accompanied by fever, last more than three weeks, or the affected individual has difficulty swallowing. Symptoms of canker sores include small, painful, crater-like ulcers. 2  See a doctor if canker sores are accompanied by fever, last more than three weeks, or the affected individual has difficulty swallowing.