Signs of high blood sugar, also known as hyperglycemia, include weight loss, frequent urination, troubled vision and skin infections, according to WebMD. Consistent high levels of blood sugar may damage nerves, causing loss of hair in lower limbs and inability to maintain erection during intercourse.
Signs of hyperglycemia require immediate medical care, states WebMD. Types of high blood sugar include fasting hyperglycemia, which is a blood sugar reading of at least 130 milligrams per deciliter after fasting; and after-meal hyperglycemia, which is blood sugar that reads at least 180 milligrams per deciliter in diabetics and, in less common cases, more than 140 milligrams per deciliter in nondiabetics.
Causes include consuming excess carbohydrates, stress, inactivity, and skipping insulin injections or medications to lower blood sugar, states WebMD. Blood tests help to know the levels of blood sugar. Urine tests may help determine if a person's urine contains ketones.
Changing diet and medications, and drinking more fluids, after consulting with a doctor, may help counter the problem, according to WebMD. Exercising more may improve the condition, but the activity may worsen the problem in people with ketones in their blood or urine. Testing blood sugar levels often, and sticking to a meal and medication plan may help prevent the problem. People with high blood sugar levels should wear a medical identification necklace or bracelet to inform the public in case of an emergency.