1)Being on medications for a long time:
Mostly we feel some different kind of taste in mouth after or during illness. It is because of the medicines or drugs you are consuming. These medicines cure the diseases like diabetes, thyroid or bacterial diseases, but give the side effect of this bad taste feeling.know the reason behind bitter taste in mouth
Sometimes the diseases like diabetes, cancer and thyroid are the reason behind metallic taste in mouth. Vitamins deficiency and nervous system related issues can cause and this. The senses related to taste are damaged and no taste can be felt.