Poor wound healing
Wounds that heal slowly, poorly or not at all can point to problems with blood supply, blood sugar, nutrition or the immune system. Diabetes and poor circulation are common causes, but shortages of vitamin C, zinc or protein, and some medicines, also impair healing.
What it means
Healing a wound is an active, resource-hungry process: the body needs a good blood supply to deliver oxygen and nutrients, adequate nutrition to build new tissue, and a working immune system to fight infection and clear debris. When any of these is impaired, wounds heal slowly, break down, or become chronic. The most common medical causes are diabetes (high blood sugar damages small blood vessels and nerves and impairs the immune response, which is why foot ulcers are a major concern) and poor circulation from narrowed arteries or venous problems in the legs. Nutrition matters greatly: vitamin C is essential for making collagen (its severe lack, scurvy, causes wounds to heal poorly or reopen), zinc and protein are needed to build tissue, and general malnutrition slows everything down. Other contributors include smoking, obesity, older age, infection in the wound, pressure over one area, certain medicines (steroids, chemotherapy, some immune-suppressing drugs), and conditions that weaken the immune system. So a wound that is slow to heal — particularly a leg or foot wound, or one in someone with diabetes or a poor diet — is a signal to look for a treatable underlying cause rather than just to keep dressing it.
Common causes
- Diabetes — high blood sugar impairs vessels, nerves and immunity; foot ulcers are a key concern.
- Poor circulation — narrowed arteries or venous problems, especially in the legs.
- Nutritional deficiency — vitamin C (scurvy), zinc, protein, or general malnutrition.
- Smoking and obesity.
- Wound infection or continued pressure.
- Medicines — steroids, chemotherapy, some immune-suppressing drugs.
- A weakened immune system.
Lab work-up approach
- Glucose / HbA1c — for diabetes, a leading cause.
- Vitamin C — for scurvy, which impairs collagen and healing.
- Zinc — needed for tissue repair.
- Albumin and nutrition markers — reflect protein status and general nutrition.
- Full blood count and inflammatory markers (CRP) — for infection or anaemia.
- Circulation assessment — for arterial or venous disease in the limbs.
Tests Mediora.AI can interpret
Related conditions
Panels to consider
When to see a doctor
A wound that is not healing as expected — especially a foot or leg wound, one in someone with diabetes, or one accompanied by pain, spreading redness, warmth, discharge or fever (signs of infection) — should be reviewed by a doctor or nurse, as it may need treatment of an underlying cause such as diabetes, poor circulation or a nutritional deficiency, and infected or diabetic foot wounds can become serious. Persistent non-healing wounds also occasionally reflect other conditions that need assessment. Mediora.AI can highlight when a raised blood sugar, a low vitamin C, zinc or albumin, or markers of infection line up with a story of poor healing so the underlying pattern is visible; assessing the wound and treating the cause belongs with your healthcare team.