I'm wondering when extra thirst is enough to ask a doctor about. How much can be attributed to the fact that it's summer and it's just plain hot? I seem to be thirsty all the time right now. I have cut down my diet drinks to one a day (and i don't like coffee so I don't drink it) but I seem to be wanting to drink water almost all the time. I know because of a friend's family history that thirst can be related to diabetes but I don't know how much or if there would be other symptoms.