Thirsty old want to drink water consider diet too salty, emotional stress, diabetes and other causes. 1. Diet too salty: If patients use too much salty food, such as salted vegetables, can make the extracellular fluid osmotic pressure increase, stimulate the hypothalamus osmotic pressure receptors, will cause the feeling of thirst, the desire to drink water increased. 2. Emotional tension: when patients are emotionally stressed, their sympathetic nerves will be excited, leading to peripheral vasoconstriction, saliva will be reduced, which will make the patient feel thirsty, always want to drink water feeling. 3. Diabetes: diabetic patients due to their urine sugar excess, causing osmotic diuresis, increased urination, resulting in patients with thirst, always want to drink water. If there is a thirst, always want to drink water, should be as soon as possible to seek medical attention, clear cause for standardized treatment, so as not to delay the condition.