What are the symptoms of high blood sugar?
Sep 13, 2025
Source: Cainiu Health
Dr. Liu Feng
Introduction
Under normal circumstances, symptoms of high blood sugar mainly include excessive thirst, frequent urination, increased appetite, weight loss, and fatigue. If discomfort occurs, it is recommended to seek timely medical evaluation and examination at a reputable hospital. In addition, some patients may also experience symptoms such as skin itching, slow wound healing, and blurred vision. If you notice any of the above symptoms, you should adjust your diet promptly and reduce the intake of high-sugar and high-fat foods.
Generally, the symptoms of high blood sugar mainly include increased thirst, frequent urination, increased appetite, weight loss, and fatigue. If discomfort symptoms occur, it is recommended to seek timely medical examination at a reputable hospital. Detailed analysis is as follows:
1. Increased Thirst
When blood sugar rises, the concentration of glucose in the blood exceeds the normal range. The kidneys cannot completely reabsorb the glucose, and the excess glucose is excreted in the urine, leading to an increased urine osmotic pressure, which removes large amounts of water from the body. The body's water deficiency stimulates the thirst center, causing increased thirst. Patients often feel thirsty frequently and need to drink large amounts of water to relieve it.
2. Frequent Urination
Excessively high blood sugar causes an increased amount of glucose filtered by the kidneys, exceeding the reabsorption capacity of the renal tubules, resulting in osmotic diuresis. The glucose content in the urine increases, leading to increased urine volume. Patients may experience frequent urination with larger volumes each time, especially with a significant increase in nighttime urination frequency.
3. Increased Appetite
Although blood sugar levels are high, body cells cannot effectively take up and utilize glucose, resulting in insufficient cellular energy supply. The brain then sends hunger signals, prompting the patient to eat. Patients often experience hunger easily, eat more than before, and may feel hungry again shortly after eating.
4. Weight Loss
Despite an increased food intake in patients with high blood sugar, cells cannot fully utilize glucose for energy, so the body breaks down fat and protein to supplement energy. Long-term excessive consumption of fat and protein leads to weight loss, and some patients may experience significant weight changes within a short period.
5. Fatigue
Cells cannot effectively obtain glucose, leading to insufficient energy supply, which affects the normal functioning of various organs in the body, resulting in fatigue. Patients often feel tired and lack energy; daily activities such as walking or standing may feel strenuous, and symptoms are difficult to fully relieve even after rest.
In addition, some patients may also experience symptoms such as skin itching, slow wound healing, and blurred vision. If the above symptoms are noticed, timely dietary adjustments are necessary, including reducing intake of high-sugar and high-fat foods and increasing consumption of fiber-rich foods such as vegetables and whole grains. At the same time, regular exercise and weight control are recommended, and medical attention should be sought for blood sugar monitoring when necessary, to prevent further progression of the condition.
