Healing requires a coordinated response involving blood circulation, immune cells, collagen production, and the formation of new tissue. High blood glucose can interfere with several of these processes.
Why can diabetes delay wound healing?
Persistently elevated glucose may impair immune function and make it harder for the body to respond effectively to certain infections. Diabetes can also damage small blood vessels and, over time, contribute to peripheral arterial disease, which reduces blood flow to the legs and feet.
Reduced circulation means injured tissue may receive less oxygen and fewer nutrients. If sensation is also reduced, a person may not notice an injury until it has become more serious.
These factors can create a cycle in which an injury heals slowly, becomes infected, and causes additional tissue damage.
Nevertheless, slow healing is not specific to diabetes. Poor circulation, smoking, nutritional deficiencies, certain medications, chronic skin conditions, and other medical problems can also delay recovery.
Which wounds deserve particular attention?
Pay attention to cuts, blisters, ulcers, or pressure injuries that do not appear to be improving. Signs of infection may include spreading redness, warmth, increasing pain, pus, swelling, or fever.
People with diabetes should seek prompt medical advice for foot wounds, especially if sensation or circulation is reduced. Do not wait for a wound to become painful because nerve damage can make serious injuries surprisingly painless.
A wound that becomes black, develops rapidly spreading discoloration, or is accompanied by fever or severe illness needs urgent assessment.
How can you reduce the risk?
Keep minor wounds clean, protect them with an appropriate dressing, and monitor them for changes. Avoid using harsh chemicals or unproven home remedies on an open wound.
If you have diabetes, regular foot examinations and suitable footwear are important preventive measures. Your healthcare professional can also help you manage blood glucose, assess circulation, and arrange specialist foot care when needed.
If repeated wounds are healing slowly, a clinician may recommend blood glucose testing alongside an evaluation for other causes.
4. Persistent Itching, Recurrent Infections, or Unusual Skin Changes
The skin can sometimes provide clues about underlying metabolic or medical problems. People with diabetes may experience dry skin, itching, fungal infections, bacterial infections, and certain characteristic skin changes.
However, these conditions are common in people without diabetes, too. Their presence alone cannot establish a diagnosis.
Why can diabetes affect the skin?
High blood glucose may affect the body's ability to respond to infections. In some people, elevated glucose and associated metabolic changes can create conditions that favor recurring infections.
Diabetes can also contribute to dehydration when glucose levels become very high, potentially worsening dry skin. Circulatory changes and nerve damage may further complicate skin health.
Common examples include fungal infections affecting the feet or groin, recurrent skin infections, and itching associated with dryness.
Darkened or thickened skin
A condition called acanthosis nigricans causes darker, thicker, sometimes velvety patches of skin. These commonly appear around the neck, armpits, or groin.
Acanthosis nigricans can be associated with insulin resistance and may occur in people at increased risk of type 2 diabetes. However, it is not a diagnosis of diabetes, and other causes are possible.
If you notice new, unexplained darkening or thickening of skin in these areas, a clinician can assess it and determine whether metabolic screening is appropriate.
Recurring fungal infections
Fungal infections can cause itching, redness, scaling, and discomfort. Repeated infections may warrant investigation, particularly when they occur alongside increased thirst, frequent urination, or unexplained fatigue.
However, fungal infections also occur for many other reasons, including moisture, friction, antibiotic use, and individual susceptibility.
Treatment should be directed at the actual skin condition rather than assuming that every infection is caused by elevated blood glucose.
When should you seek help?
Seek medical advice for persistent itching without a clear cause, recurrent infections, or skin changes that are spreading or not responding to treatment.
Rapidly worsening redness, severe pain, fever, or a suspected deep infection requires prompt medical attention.
Good skin care, appropriate treatment of infections, and management of any underlying condition can help reduce recurrence.
5. Fatigue That Does Not Improve With Rest
Fatigue is one of the most common symptoms reported by people with diabetes, but it is also one of the least specific. It can arise from sleep deprivation, stress, anemia, thyroid disorders, depression, infections, medication effects, and numerous other conditions.
The important distinction is between ordinary tiredness after exertion and persistent fatigue that interferes with daily life.
How can diabetes cause fatigue?
When insulin production or action is insufficient, glucose may remain elevated in the bloodstream instead of being used efficiently by tissues.
The body may also lose glucose through urine when blood sugar exceeds the kidneys' capacity to reabsorb it. This can increase urination and contribute to dehydration.
These processes, together with changes in metabolism and sleep disruption caused by nighttime urination, may contribute to fatigue.
Some people with diabetes also experience large changes in blood glucose throughout the day, which can affect how they feel.
However, fatigue alone does not establish that blood sugar is high. It is important to consider the broader pattern of symptoms.
What other symptoms might occur?
Fatigue associated with diabetes may appear alongside: