Considering chemosensory problems, head trauma, infection, and psychiatric Condition leads to sudden loss.
Candidiasis is a yeast infection causing taste problems. Candida over grows. Naturally apart of the body. (Mouth, and throat)
Phase locking occurs. Neurons alternate to respond to the phase cycle. This is how individual auditory fibers respond to high frequencies.
Necrosis is the death to the cells in the body due to infections or damage to the flow of blood.