I have had bad hiccups all day on and off. why?

Bitter Sour Or Sweet: First have you tried to get rid of them? Try holding your breath, licking a lemon,swallowing a teaspoon of sugar or drinking some bitters(not all at once!).Usually what's causing it is nothing serious and will go away in a day or less, but if it lasts longer you won't be a happy camper and should get some medication in the ER or Urgent Care. There are more serious causes, but very rare at your age