Christopher D. Saudek, M.D., Hugh P. McCormick Family Professor of Endocrinology and Metabolism, Johns Hopkins University School of Medicine shed some light on the matter.
Not all cases of diabetes involve symptoms of high blood sugar. It is worth screening if you have a strong family history. If you have reason to think that you may have diabetes, because sometimes it’s asymptomatic, it is important to know if your blood sugar is high. If upon investigation diabetes does surface then you should aim to get it under control early.
High blood sugar levels, say over 200, can cause the symptoms to show. Classic symptoms would be: increased thirst, increased urination, general fatigue, vaginal infections in women and even blurred vision can occur.
These symptoms, as mentioned earlier, may not occur, or they may occur in any combination. The actual cause is the sugar that thickens the blood sugar. It’s really like pouring maple syrup into a glass of water; the water continues to get thicker and thicker. In case of the bloodstream, the brain reads the blood as too thick. Therefore, it feels the need to drink water in order to dilute back out the blood. Sometimes, people with diabetes drink gallons of water in a day, in order to quench their thirst. And so the need to urinate more often emerges. That, however, doesn’t really solve the problem. It does not curing or treat diabetes in any way. In fact, thirst and urination are the classic symptoms of diabetes and indicates that you do need help.