text: what is wrong with me?? tired, hungry, thisty all the time.? i am in my young 20's and i am constantly exhausted, very hungry, thirsty, cold and just plain out of energy.  i know i am not pregnant, so it can't be that.  but i really don't know whats wrong with me.  i get between 6-7 hrs of sleep on average, but on the weekends, i feel like i just can't get up.  plus i am always so hungry and thirsty.  what could it be?  anyone else feel like this?  what should i do? first thing you do is make an appointment to your m.d. at your age the symptoms you've mentioned has to be taken very seriously. you don't want to end up with untreated diabetes, thyroid dysfunction, immune system disorder etc.,yahoo people are great ,but you need professional advice.