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 several possible causes of a sore throat without other symptoms like runny nose, fever, and cough. First, sometimes the throat can become irritated from things that you are ingesting. Spicy foods can sometimes do this, and smoking is another common cause of chronic sore throat.