Final answer:
Excessive urination and excessive thirst are common symptoms suggestive of diabetes. The kidneys are unable to filter excess glucose, resulting in sweet urine and dehydration, causing the person to be continually thirsty.
Step-by-step explanation:
Two of the early manifestations of diabetes are excessive urination and excessive thirst. They demonstrate how the out-of-control levels of glucose in the blood affect kidney function. The kidneys are responsible for filtering glucose from the blood. Excessive blood glucose draws water into the urine, and as a result the person eliminates an abnormally large quantity of sweet urine. The use of body water to dilute the urine leaves the body dehydrated, and so the person is unusually and continually thirsty. The person may also experience persistent hunger because the body cells are unable to access the glucose in the bloodstream.