If left untreated, hyperglycemia can lead to long-term complications. It can harm your eyes by damaging the blood vessels of the retina, which can lead to blindness. Hyperglycemia can also cause cataracts, which is the clouding of the lens of the eye.
You might develop bone or joint problems as well as teeth and gum infections. Skin issues like bacterial or fungal infections along with non-healing wounds might occur. Poor blood flow and damaged nerves can lead to feet problems and amputations. Nerve or kidney damage known as neuropathy or diabetic nephropathy are also long-term complications of hyperglycemia along with cardiovascular disease.

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