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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Short time spikes should not cause serious complications.
However long standing spikes can weaken your immune system as sugar binds to the blood cells inactivating them.
Serious infection is possible.
Also other organs like nerves, blood vessels, eyes, kidneys also can get affected.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/