Excessive thirst is an abnormal feeling of always needing to drink fluids. Drinking lots of water is usually healthy. However, the urge to drink too much may be the result of a physical or emotional disease. Excessive thirst may be a symptom of high blood sugar (hyperglycemia). It can be an important clue in detecting diabetes.
Excessive thirst is a fairly common symptom. It is often the reaction to fluid loss during exercise, or to eating salty foods.
Polydipsia
Nocturia
Polyuria
Dysuria
Hyperosmia
Somnolence
Anosmia
Constipation  