Major symptoms of hyperglycemia include increased thirst, urination, hunger, fatigue, and blurred vision. Hyperglycemia is the medical term for abnormal blood glucose or high blood sugar. This problem is common in diabetic patients. Hyperglycemia usually occurs when blood sugar levels exceed 125 mg/dL during fasting and 180 mg/dL after two hours of eating. Let us know other things related to it – Glucose is the main source of energy in the body, it is obtained from the food we eat. Several factors affect glucose levels, including eating habits and exercise. Apart from this, changes in the amount of glucose also come due to any disease, infection or consumption of medicines. Apart from this, the amount of glucose in the blood also increases due to lack of insulin. It is very important for diabetic patients to monitor their blood sugar level. Glucose level is affected due to how much activity level of the patient, how much carbs are being taken and whether or not they are taking medicine or not. Apart from this, stress also plays an important role in increasing the sugar level. It is very important for diabetic patients to monitor their blood sugar level. Glucose level is affected due to how much activity level of the patient, how much carbs are being taken and whether or not they are taking medicine or not. Apart from this, stress also plays an important role in increasing the sugar level. Major symptoms of hyperglycemia include increased thirst, urination, hunger, fatigue and blurred vision. These symptoms start appearing gradually and sometimes go unnoticed for a long time. Blood vessels, eyes, heart, kidneys and nerves can be damaged if treatment is not started on time. In severe cases, there is also a risk of ketoacidosis and diabetic coma.