Diabetes, a chronic condition characterized by high blood sugar levels, can manifest with various symptoms at different times of the day.

Excessive thirst – According to India Times, one of the most common symptoms of diabetes is excessive thirst, known as polydipsia. People with diabetes often wake up feeling extremely thirsty because the body is trying to manage high blood sugar levels. The kidneys must work harder to filter and absorb excess glucose, a process that requires a large amount of fluid, leading to dehydration and increased thirst. You may also notice a dry mouth. This symptom can occur throughout the day but is more noticeable in the morning upon waking. 

Headache and fatigue – Fatigue is a hallmark symptom of diabetes, and it can occur even in cases where diabetes is not well-controlled. High blood sugar prevents the body from using glucose effectively for energy. Patients may experience symptoms such as tiredness, headaches, and weakness despite having had enough sleep. This persistent exhaustion can significantly affect daily activities.

Increased hunger – Even after eating well the day before, people with diabetes may wake up feeling extremely hungry, according to the UK’s National Health Service (NHS). This heightened hunger, known as polyphagia, happens because the body’s cells are not receiving enough glucose due to insulin resistance or lack of insulin. As a result, the brain signals the body to eat more to meet energy needs. Blood sugar levels below 4 mmol/L often trigger symptoms like hunger, shakiness, and sweating—typical early warning signs. In more severe cases, confusion and difficulty concentrating may also occur. 

Blurred vision – According to Hindustan Times, if you experience blurred vision upon waking, you should quickly check your blood sugar. Excess sugar in the blood can damage the small blood vessels in the eyes, affecting one or both eyes. High blood sugar can also cause swelling of the eye’s lens, leading to blurred vision. This condition usually improves when blood sugar levels return to normal. 

Nausea – Another common morning warning sign of high blood sugar is nausea. This may be due to complications from diabetes or other medical conditions. Most nausea is harmless and temporary, but when accompanied by other abnormalities, it can signal more serious diabetes-related issues. 

Numbness or tingling in the hands and feet – High blood sugar (glucose) can damage nerves, according to Healthline. Nerves in the legs and feet are most often affected by diabetic neuropathy. Symptoms can range from tingling and pain to numbness in the hands, legs, and feet, depending on which nerves are involved. This symptom often feels more pronounced in the morning due to prolonged pressure on certain nerves while sleeping. 

Erectile dysfunction – Men with diabetes, especially type 2 diabetes, often experience erectile dysfunction, meaning they cannot achieve or maintain an erection firm enough for sexual intercourse—particularly in the morning. This condition may result from prolonged blood sugar regulation issues, leading to nerve and blood vessel damage.