Bed sore healing time depends almost entirely on how deep the wound is. A shallow Stage 2 sore heals in roughly three weeks on average, while a deep Stage 3 or 4 wound can take months, and many never fully close without surgery. Understanding which stage you’re dealing with is the starting point for any realistic timeline.
Healing Times by Stage
Pressure injuries are classified into four stages based on depth, and each stage follows a very different healing trajectory.
Stage 1 is the mildest form: the skin is intact but shows a persistent red or discolored area that doesn’t blanch when you press on it. These aren’t open wounds, and with proper pressure relief they typically resolve within a few days to about a week.
Stage 2 sores involve a partial break in the skin, sometimes appearing as a shallow open wound or a ruptured blister with a pink or red wound bed. A secondary analysis published in the Journal of Wound, Ostomy and Continence Nursing found that Stage 2 sores healed in an average of 23 days, with a median of 18 days. Size matters significantly here: sores smaller than about 3 centimeters healed in roughly 19 days, while those 3 centimeters or larger took closer to 31 days.
Stage 3 wounds extend through the full thickness of the skin into the fat layer underneath. Stage 4 wounds go even deeper, exposing muscle, tendon, or bone. These are serious injuries. In one randomized controlled trial tracking Stage 3 and 4 pressure injuries, only 13% of wounds healed within a year. The median healing time was about 118 days, or roughly four months, and even that only applied to the fraction that closed at all.
There’s also a category called unstageable, where dead tissue covers the wound bed so thoroughly that a clinician can’t tell how deep the damage goes. These wounds can’t be properly staged or treated until the dead tissue is removed.
Why Some Sores Stall or Get Worse
Several factors can slow healing dramatically or stop it altogether. The most common is continued pressure on the wound. If the person can’t reposition themselves or isn’t being repositioned regularly, the tissue never gets enough blood flow to repair itself.
Diabetes is one of the biggest complicating factors. High blood sugar stiffens blood vessels, reducing circulation and starving the wound of oxygen. It also weakens the immune cells that fight infection and clean up damaged tissue, leaving the wound stuck in a prolonged inflammatory state. On top of that, diabetic nerve damage can make it impossible to feel the sore, so people don’t notice the problem until it’s advanced. Growth factors that normally drive tissue repair are produced at lower levels in diabetic tissue, further stalling the process.
Poor nutrition is another major barrier. Wound healing demands a surprising amount of energy and protein. Clinical guidelines recommend 30 to 35 calories per kilogram of body weight per day and 1.25 to 1.5 grams of protein per kilogram per day for people with Stage 2 or deeper pressure injuries. For a 150-pound person, that translates to roughly 2,000 to 2,400 calories and 85 to 100 grams of protein daily. Many older adults or chronically ill patients fall well short of those numbers without targeted nutritional support. Adequate hydration, around 30 milliliters per kilogram of body weight, also plays a direct role in tissue repair.
Other conditions that impair healing include peripheral artery disease, heart failure, kidney disease, and any condition requiring medications that suppress the immune system.
Complications That Change the Timeline
Deep pressure injuries carry a real risk of bone infection, known as osteomyelitis. This happens when bacteria from the wound reach the underlying bone. Signs include swelling, warmth, and increasing tenderness around the wound, along with fever and fatigue. Osteomyelitis typically requires surgery to remove the infected bone tissue, followed by weeks of intravenous antibiotics. If it develops, healing time extends significantly, and the infection can spread to nearby joints or, in severe cases, enter the bloodstream.
Any wound that develops increasing redness around the edges, a foul smell, unusual drainage, or is accompanied by fever deserves urgent medical attention. These are signs the sore may be infected, and an untreated infection can turn a manageable wound into a life-threatening one.
How Repositioning Prevents and Promotes Healing
Repositioning is the single most important intervention for both preventing and healing bed sores. The standard recommendation is to turn a bedridden person every two hours on a standard mattress. If the person is on a specialized pressure-redistribution surface, that interval can be extended to every four to six hours. These guidelines have been part of clinical practice since the time of Florence Nightingale, and while the exact optimal frequency still lacks strong evidence, the principle is straightforward: tissue that’s been compressed needs regular periods without pressure to receive blood flow.
For wheelchair users, shifting weight every 15 to 30 minutes helps relieve pressure on the sitting bones. Pillows or foam wedges between bony areas like the knees and ankles reduce friction and shearing forces that damage skin.
Treatments That Speed Up Healing
When a wound contains dead or dying tissue, healing can’t progress until that tissue is removed, a process called debridement. The body does this naturally to some extent, and moist wound dressings can support that process. But when natural debridement is too slow, clinicians may use sharp debridement, which involves cutting away the dead tissue with a scalpel or scissors. This is faster than other methods and allows healing to begin sooner. Other approaches include enzyme-based dressings that dissolve dead tissue and, less commonly, medical-grade maggot therapy, which selectively consumes necrotic tissue while leaving healthy tissue intact.
For deep or slow-healing wounds, negative pressure wound therapy (sometimes called a wound vac) can significantly accelerate recovery. This involves sealing the wound with a special dressing connected to a pump that applies gentle suction. In a randomized trial of patients with difficult-to-heal wounds, including severe pressure ulcers in people with spinal cord injuries, negative pressure therapy cut the wound in half roughly twice as fast as conventional dressings: a median of 2 weeks to reach 50% volume reduction, compared to 3.5 weeks with standard care.
Stage 3 and 4 wounds that fail to heal with these approaches may require surgical reconstruction, where a surgeon closes the wound using tissue flaps. Given that fewer than 1 in 7 deep pressure injuries heal within a year with conservative treatment alone, surgery becomes a realistic consideration for many patients with advanced wounds.
What You Can Do to Support Healing
If you’re caring for someone with a bed sore, the most impactful steps are consistent repositioning, keeping the wound clean and appropriately moist, and ensuring adequate nutrition. Protein intake is especially critical. Eggs, Greek yogurt, poultry, fish, beans, and protein supplements can help meet the higher demands of wound healing. Keeping blood sugar well controlled in diabetic patients removes one of the biggest obstacles to tissue repair.
Monitor the wound’s size and appearance regularly. A healing wound should gradually get smaller, with pink or red tissue filling in from the edges. A wound that stays the same size for two or more weeks, or that develops new drainage, odor, or surrounding redness, needs reassessment by a healthcare provider. Early-stage sores respond well to basic care, but deep or stalled wounds often require specialized wound care teams to get healing back on track.