You might have xerostomia, aka dry mouth: Your mouth can get dry due to a number of factors.
It might be your liver: A bad taste in your mouth can actually be caused by hepatitis B.
Menopause: If this is your case, there are things you can do to stimulate saliva production.
Pregnancy: Hormone fluctuations experienced during pregnancy can also affect taste.
It’s pretty common: We’ve all, at some point in our lives, had a strange or bad taste in our mouths.