A chronic wound is one that hasn’t made meaningful healing progress within about four weeks, though some clinicians use a three-month threshold. The core problem is almost always the same: the wound gets stuck in the inflammatory phase of healing, where the body’s cleanup crew never hands off to the repair crew. Healing these wounds requires a combination of treating the underlying cause, preparing the wound bed, choosing the right dressings, and giving your body the nutritional fuel it needs to rebuild tissue.
Why Chronic Wounds Get Stuck
Normal wound healing moves through a predictable sequence: inflammation clears out damaged cells, then new tissue grows in, and finally the skin remodels and strengthens. Chronic wounds stall in that first inflammatory stage. The inflammation becomes self-perpetuating, producing an excess of reactive oxygen species (unstable molecules that damage surrounding tissue faster than the body can neutralize them). Instead of transitioning to regrowth, the wound stays in a destructive loop.
In people with uncontrolled diabetes, the immune cells responsible for orchestrating this transition don’t function properly. Key growth signals and blood-vessel-building compounds are deficient, so the wound can’t recruit the cells it needs to lay down new tissue. The surface skin cells that should migrate across the wound to close it are sluggish, and proteins in the wound bed get broken down too aggressively. The result is a wound that looks the same week after week.
The Four Most Common Types
Chronic wounds aren’t all the same, and identifying which type you have determines the treatment approach.
- Venous ulcers are the most common chronic wound. They develop on the lower legs when valves in the veins don’t push blood back toward the heart efficiently, causing fluid to pool, swelling, and eventually skin breakdown. You may notice brownish skin discoloration and hardened tissue around the wound.
- Arterial ulcers happen when narrowed arteries can’t deliver enough oxygen-rich blood to the tissue. These tend to appear on the feet and toes and are often painful.
- Diabetic foot ulcers result from a combination of nerve damage (so you may not feel the injury happening), reduced blood flow, and foot deformities that concentrate pressure on certain spots.
- Pressure ulcers form over bony prominences like the tailbone, heels, or hips when sustained pressure cuts off circulation to the skin.
Each type has a different root cause, which is why simply keeping a wound clean and bandaged often isn’t enough. Venous ulcers need compression to counteract the pooling blood. Arterial ulcers may need procedures to restore blood flow. Diabetic foot ulcers require offloading pressure and blood sugar management. Pressure ulcers demand consistent repositioning. Without addressing that underlying driver, the wound will keep stalling.
Debridement: Clearing the Way for New Tissue
Dead and damaged tissue sitting in the wound bed acts like a roadblock. It harbors bacteria, fuels ongoing inflammation, and physically prevents new cells from growing. Removing this tissue, called debridement, is one of the most important steps in chronic wound care. The 2023 Wound Healing Society guidelines recommend removing all necrotic or devitalized tissue as a standard part of treatment.
There are several approaches. Sharp or surgical debridement uses a scalpel or scissors and is the fastest option. Autolytic debridement relies on moisture-retaining dressings that let the body’s own enzymes soften and dissolve dead tissue over days. Enzymatic debridement uses topical agents that chemically break down dead tissue. Biological debridement, using medical-grade maggots, has shown consistently positive results in treating chronic wounds. Newer methods like hydrosurgery and low-frequency ultrasonic debridement are gaining attention because they prepare the wound bed faster and tend to cause less pain.
Debridement isn’t a one-time event for most chronic wounds. Dead tissue can re-accumulate, and repeated debridement sessions are often needed to keep the wound bed clean and receptive to healing.
Choosing the Right Dressing
The goal of a wound dressing is to maintain a moist healing environment without letting the wound become waterlogged or dry out. The amount of fluid your wound produces determines which dressing type works best.
- Alginate dressings (made from seaweed-derived fibers) excel at absorbing large amounts of fluid and are well suited for heavily draining wounds, whether infected or not. They should not be used on dry wounds or wounds producing very little fluid, as they can dehydrate the tissue.
- Foam dressings handle moderate to high levels of drainage. They provide a cushioning layer and some thermal insulation, and silicone-based versions offer antimicrobial properties.
- Hydrocolloid dressings also absorb fluid well and work for wounds with significant drainage. They form a gel-like layer over the wound that keeps the environment moist.
For wounds producing minimal fluid, moisture-donating dressings like hydrogels help prevent the wound bed from drying out. Your wound care provider will likely change dressing types as the wound progresses through different healing stages and fluid output changes.
Advanced Treatments for Stubborn Wounds
Negative Pressure Wound Therapy
Negative pressure wound therapy (often called a wound VAC) places a sealed foam or gauze dressing over the wound connected to a gentle suction pump. The suction pulls excess fluid out of the surrounding tissue, reducing swelling and releasing pressure on blood vessels so they can deliver more oxygen and nutrients. In one landmark study, blood flow to the wound increased fourfold at the standard suction setting. The therapy also significantly reduces bacteria in the wound. In animal studies, bacterial counts dropped from 100 million organisms to just 1,000 within four to five days, while wounds treated with standard gauze dressings saw bacterial counts rise.
Hyperbaric Oxygen Therapy
Hyperbaric oxygen therapy involves breathing pure oxygen in a pressurized chamber, which saturates your blood with far more oxygen than normal breathing delivers. For diabetic foot ulcers, the typical protocol is a 90-minute daily session for 30 to 40 days. For wounds related to radiation damage, 30 to 60 sessions may be needed. It’s generally reserved for wounds that haven’t responded to standard care, particularly those complicated by poor circulation, radiation injury, or bone infection.
Blood Sugar Control for Diabetic Wounds
If you have diabetes, your blood sugar levels directly affect how well your wound heals. Research from a study published in Diabetes Care found that an A1C between 6.5% and 8.0% was considered acceptable glycemic control for wound healing, with most participants targeted to 7.0% to 7.5%. Interestingly, the study found no clear benefit to pushing A1C below 6.5% (very tight control) in this population, likely because aggressive blood sugar lowering carries its own risks in people who already have complications. The practical takeaway: steady, moderate blood sugar control matters more than perfection.
Nutrition That Supports Wound Repair
Your body needs significantly more protein and certain micronutrients when healing a wound than it does during normal maintenance. The Agency for Healthcare Research and Quality recommends 1.25 to 1.5 grams of protein per kilogram of body weight daily for people with chronic wounds, along with 30 to 35 calories per kilogram. For a 170-pound person, that translates to roughly 95 to 115 grams of protein per day, well above what most people eat without actively trying.
Zinc and vitamin C are the two supplements most consistently recommended for wound healing. Vitamin C is essential for collagen production, and supplementation of 500 to 1,000 milligrams daily in divided doses is suggested for smaller wounds, increasing to 1 to 2 grams per day for more severe wounds. Zinc plays a central role in both collagen metabolism and immune function. Vitamin A becomes particularly important if you’re taking corticosteroids, which suppress the inflammatory response your body needs to initiate healing. Vitamin D and B12 deficiencies are common in older adults and can independently impair wound repair.
Calorie intake matters too. Your body can’t build new tissue if it’s in an energy deficit. A nutritional assessment should happen early in your wound care, and whenever your health status changes.
Signs a Wound Has Become Infected or Formed a Biofilm
Bacteria in a chronic wound can organize into a biofilm, a protective slimy layer that shields them from antibiotics and your immune system. A biofilm is one of the most common reasons chronic wounds refuse to heal even when everything else is being managed well.
Signs that suggest a biofilm has formed include a shiny or slimy layer on the wound surface that can be wiped away but returns quickly, poor-quality granulation tissue (the pink, bumpy tissue that signals healing), and a wound that remains stalled despite optimal care. Persistent inflammation lasting more than 30 days, failure to respond to antimicrobial treatments, and new areas of skin breakdown around the wound edges are also red flags. More concerning signs include tunneling (the wound tracking deeper along tendons or bone) and undermining (erosion of tissue beneath the wound edges).
If antibiotics seem to resolve infection symptoms but the infection returns as soon as treatment stops, that pattern strongly suggests a biofilm. Treatment typically requires physical disruption through debridement combined with topical antimicrobials, since antibiotics alone can’t penetrate the biofilm’s protective matrix.