How to cure the problem?
Also these problems are mostly faced by athletes, so it is advisable to have sports drinks as they have sodium and other electrolytes but check that you are drinking sports drink too much as well. Checking the underlying diseases that might happened and one can start medication to cure them. Also knowing right balance of salt and water and then knowing the how much amount of water you need is important.
Listen to your body and never forget to quench your thirst. As rightly said, nothing is good in excess so one should also avoid drinking more water than advisable level as it can deadly.