Persistent high blood sugar levels and poorly controlled diabetes can lead to serious secondary damages in multiple organ systems, the most considerable in the eyes, nerves, heart, kidneys, and blood vessels, as well as psychiatric illnesses, and even cancers and infections. Diabetes drives to loss of sensory and motor function as well as poor circulation of the hands and feet, increasing the risks of poor wound healing, ulcers and infection, and consequently limbs amputation. Keeping blood sugar, blood pressure, and cholesterol at or near normal levels can help delay or prevent diabetes complications. Therefore, diabetic patients need regular monitoring.

Sources: International Diabetes Federation
Complications (idf.org)

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