High blood sugar does not always cause obvious symptoms, especially in its early stages. In some cases, people may continue with their daily routines without realising that their glucose levels are elevated. However, certain changes in the body can offer clues that it may be time to check blood sugar levels.
Dr Ravi K Gupta, a US board-certified oncologist associated with MD Anderson, recently highlighted several possible warning signs in an Instagram post. He noted that symptoms can include excessive thirst, frequent hunger, blurred vision, slow-healing wounds and repeated infections. However, he also stressed that high blood sugar can sometimes occur without noticeable symptoms, making regular testing important.
One of the most common signs is constant thirst. When blood glucose becomes too high, the kidneys attempt to remove excess glucose through urine. This can increase urination and cause the body to lose more water, leaving a person feeling unusually thirsty.
Another possible warning sign is feeling hungry even after eating. When glucose is present in the bloodstream but the body's cells are unable to use it efficiently, a person may experience persistent hunger, stronger cravings and low energy.
Slow-healing cuts and wounds can also be associated with chronically elevated blood sugar. High glucose levels can affect circulation, blood vessels and immune function, potentially making it harder for the body to repair damaged tissue. If wounds repeatedly take longer than expected to heal, checking blood sugar may be advisable.
Blurred or fluctuating vision is another symptom that can occur when glucose levels rise. Changes in blood sugar can temporarily affect fluid balance in the eye, resulting in changes in vision. Sudden or persistent vision changes should not automatically be attributed to prolonged screen use and may require medical evaluation.
People with elevated blood sugar may also experience repeated infections, particularly urinary, fungal or skin infections. Frequent infections can have several causes, but recurring episodes may warrant further investigation.
Dr Gupta also pointed to increasing waist size as a potential metabolic warning sign. Abdominal fat is strongly associated with insulin resistance, and metabolic risks can occur at a lower body mass index among some South Asian populations.
Importantly, these symptoms are not specific to high blood sugar and can occur for other reasons. The only way to determine whether blood glucose is elevated is through appropriate testing. Anyone experiencing persistent or concerning symptoms should consult a healthcare professional rather than relying on symptoms alone.
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