Polydipsia is the medical term for extreme thirst that a person cannot quench by drinking. It is not a disease but a symptom of certain health problems, such as diabetes. People who have this symptom should see a doctor.

Why Does water not seem to quench my thirst?

Thirst you can't seem to quench, what doctors call polydipsia, is one symptom of diabetes. When you have this disease, your body doesn't make enough of the hormone insulin or doesn't use it properly. It causes too much sugar (called glucose) to build up in your body.

Why do I feel so thirsty even after drinking water?

Water straight from the tap has been stripped of its naturally occurring minerals and electrolytes. This imbalance in electrolytes can be a reason you are still feeling thirsty after drinking water. Staying properly hydrated is more than just drinking water. You should also be considering what's in your water.