Why do I wake up feeling really hungry? Last night I didn't eat a big meal or anything and on days I eat big meals it happens too.
See MD for Changes. While it is normal for people to experience brief changes in appetite, a persistent increase or decrease in appetite shoud get you over to have a proper evaluation by your physician. Common causes of altered appeitite include anxiety and depression, pregnancy, thyroid problems, and more severe illnesses including infections and even tumors. Please contact your physician.