Excessive thirst, also known as polydipsia, is a condition where an individual feels an intense need to drink fluids more than usual. This can be caused by various factors, including dehydration, high salt intake, or certain medical conditions like diabetes mellitus and diabetes insipidus. In some cases, excessive thirst may indicate an underlying health issue that requires attention. It is important to monitor fluid intake and consult a healthcare professional if the thirst persists, as it may lead to complications if left untreated.