Many different conditions can cause excessive thirst. Diabetes will cause this, as well as eating foods that are heavily laden with salt.
Could be diabetes.
Putting aside normal thirst from lack of drinking, extreme thirst can be a symptom of diabetes.
insulin
ADH
Polydipsia is the term for excessive thirst. It can be a symptom of Diabetes mellitus or diabetes insipidus.Polydipsia
Excessive drinking or thirst
Polyuria (excessive urination), polyphagia (excessive hunger), and polydipsia (excessive thirst).
polydipsia - excessive thirst
-dipsia is the medical terminology combining form meaning thirst, as in polydipsia (excessive thirst).
Polyuria and thirst which is increased frequency of passing water and excessive thirst
excessive thirst, hunger, and urination.
Frequent urination, excessive thirst, and sugar in the urine.
Polydipsia (medical) means excessive or abnormal thirst.