Damage to organs, nerves and blood vessels is a side effect of having high blood sugar. Additionally, poor vision, skin infections and frequent urination are side effects of chronic high blood sugar levels, states WebMD.
Headaches, poor concentration, increased thirst, feelings of fatigue and weight loss are side effects of high blood sugar levels. Persistent high blood sugar levels can also cause wounds to heal slowly; stomach and intestinal problems such as diarrhea or constipation; and damage to the kidneys. Men with high blood sugar levels may experience erectile dysfunction, and women may be more susceptible to vaginal infections. Pain and sensitivity can occur in the feet as a result of nerve damage due to high blood sugar levels, and hair loss may occur in the lower limbs, reports WebMD.
Untreated high blood sugar levels can lead to serious complications such as ketoacidosis, an accumulation of acids in the blood of some Type 1 diabetics. High blood sugar levels can also lead to hyperglycemic hyperosmolar nonketotic syndrome, a potentially life-threatening condition occurring in some Type 2 diabetics, explains WebMD. This condition occurs as a result of very high blood sugar levels and leads to severe dehydration.
People with Type 1 or Type 2 diabetes are most commonly affected by high blood sugar levels. However, high blood sugar levels can occur in people without diabetes after they consume a very large meal. Following a diet and exercise program and taking medication can be helpful for controlling blood sugar, according to WebMD.