DAILY SERIES · WOUND LINE
Why some wounds won't heal: the 4-week rule
Week one. Week two. Week three. Week four… and the wound looks exactly the same. If someone at home is caring for a wound that isn't moving, this is for you: it's almost never the bandage's fault. In two minutes we show you why healing stalls, the rule clinicians use to measure whether a wound will close, the signs that can't wait, and the exact question to ask your doctor.
Educational content prepared with official health sources. Professional medical review pending.
No personalized diagnoses: consult your doctor.
📅 Published October 16, 2026 · 2-minute video · Full transcript included
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A wound is a repair job — and the job stalled
A normal wound heals like a well-run repair job: you can see progress every week, because blood brings everything skin needs to rebuild — oxygen, nutrients, defenses. A chronic wound is the job that stalled halfway. And here's the thing: changing the bandage is like changing the worker — if the materials aren't arriving, the wall doesn't go up.
Point 1: the 3 usual causes
Behind it there's usually one of three causes. Circulation: veins that can't return the blood from the legs, or arteries that can't bring it in strong. Diabetes: high blood sugar slows down the repair work, and some feet no longer feel the damage. And constant pressure on the same spot, which keeps the blood out.
Point 2: the 4-week rule
Clinicians watch one thing: progress at four weeks. In diabetic foot ulcers, a prospective study put it in numbers: patients whose wound had shrunk by about half at 4 weeks went on to close in 58% of cases by week 12; those who didn't reach the halfway mark closed in only 9%. That's why the practical rule is: if it hasn't shrunk by at least half in 4 weeks, the next step isn't another ointment — it's changing the plan and finding the cause.
Note the scope: that number comes from diabetic foot ulcers under clinical care — it is not a law for every wound. But the principle does travel: a wound that fails to make sufficient progress after about 4 weeks of standard care is considered chronic, and what comes next is re-evaluating what is holding it back.
Signs that don't wait for week four
Some signs don't wait: more pain than before, a new or stronger odor, redness that keeps spreading, drainage or pus, or fever. Any one of those means get seen today — not try another home remedy.
What actually helps
Taking the pressure off the area — with a diabetic foot, offloading is one of the most important steps there is. Blood sugar in range, every day. And if the wound is a vein-related leg wound, compression prescribed by a professional.
The honest fine print
No ointment, tea, or remedy closes a wound while the cause is still there. And with diabetes there's a trap: it may hurt less than it should, because feet can lose feeling. Hurting less does not mean it's less serious.
Ask this at your next visit
“Doctor, what's keeping this wound from closing, and how will we measure it?”
If you remember one thing, make it this: if it hasn't moved in four weeks, it's not the bandage — find the cause.
Frequently asked questions
When is a wound considered chronic?
When it fails to make sufficient progress after about 4 weeks of standard care. At that point, clinical guidance is to re-evaluate the underlying cause — circulation, blood sugar, pressure — instead of just changing dressings (Frykberg & Banks, 2015).
What exactly is the 4-week rule?
It comes from a study of diabetic foot ulcers (Sheehan et al., 2003): if the wound shrank by about half at 4 weeks, the odds of it closing by week 12 on the same care were good (58% in the study); if it didn't reach the halfway mark, they were low (9%). It is a signal to change the plan, not a home diagnosis.
Which infection signs can't wait?
More pain than before, spreading redness, increasing warmth or swelling, drainage or pus, a new or stronger odor, or fever. The IWGDF/IDSA 2023 guideline notes that infection is recognized by these clinical signs: if any appears, get seen the same day.
Can I use compression on my own?
No. Compression does help venous leg ulcers close (Cochrane review, 2012), but only when a professional prescribes it: if there is also an unassessed arterial problem, compressing can harm the leg.
Referencias
- Frykberg R. G., Banks J. Challenges in the Treatment of Chronic Wounds. Advances in Wound Care 2015;4(9):560–582. doi:10.1089/wound.2015.0635
- Sheehan P., Jones P., Caselli A., Giurini J. M., Veves A. Percent change in wound area of diabetic foot ulcers over a 4-week period is a robust predictor of complete healing in a 12-week prospective trial. Diabetes Care 2003;26(6):1879–1882. doi:10.2337/diacare.26.6.1879
- Bus S. A., Armstrong D. G., Creager M. A., et al. Guidelines on offloading foot ulcers in persons with diabetes (IWGDF 2023 update). Diabetes/Metabolism Research and Reviews 2024;40(3):e3647. doi:10.1002/dmrr.3647
- Senneville É., Albalawi Z., van Asten S. A., et al. IWGDF/IDSA Guidelines on the Diagnosis and Treatment of Diabetes-related Foot Infections (IWGDF/IDSA 2023). Clinical Infectious Diseases 2024;78(1):208–229. doi:10.1093/cid/ciad527
- Guo S., DiPietro L. A. Factors Affecting Wound Healing. Journal of Dental Research 2010;89(3):219–229. doi:10.1177/0022034509359125
- O'Meara S., Cullum N., Nelson E. A., Dumville J. C. Compression for venous leg ulcers. Cochrane Database of Systematic Reviews 2012;(11):CD000265. doi:10.1002/14651858.CD000265.pub3
Full video transcript
Week one. Week two. Week three. Week four… and the wound looks exactly the same. That's not a slow wound anymore. That's a chronic wound.
A normal wound heals like a well-run repair job: you can see progress every week, because blood brings everything skin needs to rebuild — oxygen, nutrients, defenses. A chronic wound is the job that stalled halfway. And it's almost never the bandage's fault: the materials just aren't arriving.
Behind it there's usually one of three causes. Circulation: veins that can't return the blood from the legs, or arteries that can't bring it in strong. Diabetes: high blood sugar slows down the repair work, and some feet no longer feel the damage. And constant pressure on the same spot, which keeps the blood out.
Clinicians watch one thing: progress at four weeks. In a diabetic foot ulcer, if it hasn't shrunk by at least half in four weeks, the same care is very unlikely to close it. That's not meant to scare you — it's the signal to change the plan, not the bandage.
And some signs don't wait for week four: more pain than before, a new or stronger odor, redness that keeps spreading, drainage, or fever. Any one of those means get seen today — not try another home remedy.
What actually helps? Taking the pressure off the area — with a diabetic foot, offloading is one of the most important steps there is. Blood sugar in range, every day. And if the wound is a vein-related leg wound, compression prescribed by a professional.
The honest fine print: no ointment, tea, or remedy closes a wound while the cause is still there. And with diabetes, careful: it may hurt less than it should, because feet can lose feeling. Hurting less does not mean it's less serious.
Take this with you: if it hasn't moved in four weeks, it's not the bandage — find the cause. And at your next visit, ask this: “Doctor, what's keeping this wound from closing, and how will we measure it?” We're not doctors — this is information so you walk in prepared. See you tomorrow.
🎬 Video from Red de Salud Hispana's daily series, chronic-wound line. Also on YouTube, Facebook, and Instagram. The full guide is at Chronic wounds.
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