IntroductionDrinking more than 2 liters of water per day is the best bet to stay hydrated. But what if somebody feels thirsty all the time?Polydipsia refers to an abnormal feeling of constant thirst. We all feel thirsty at various times during the day. Sufficient daily water intake (several glasses) is important as water is crucial for many bodily functions, including regulating body temperature and discarding waste.