Just for that, we are only answering this one IF WE ARE OLDER  THAN 18. (Take your last question and imagine the ones older and cross them out . What's left is the ones who *wanted* to answer if they were under 18.)

Yes and No.

Depending on the severity would determine the approach I would take, or a physician for that matter.

If it is a new problem try an NSAID(Aleve & Aspirin available without prescription or with prescription Mobic(meloxicam) works great for me and is cheap. Celebrex seems to help my parents but is ridiculously expensive. Nabumetone(Relafen) … Read more

The two seemingly obvious to me are Salt water and Fresh water. There is ground water, "glacier water", very small amounts in air/vapor/steam and the largest amount in the oceans.