Wounds healing slower than usual: is it about nutrition?

Looking at a slow-healing wound alone cannot tell you whether your body is missing anything, because healing depends on many things at once. Nutrition is one item on a long list. A review of the research by Guo and DiPietro names oxygen reaching the wound, germs in the wound, age and hormones, stress, some long-term health conditions, medicines, alcohol, smoking and nutrition as factors that can slow healing. Because so many things are involved, the wound alone cannot tell you what, if anything, is missing from your diet. A doctor can look at the wound, ask about your health and medicines, and check with a blood test if needed. Age matters too: the US National Institute on Aging says that as skin gets thinner with age, scratches, cuts or bumps can take longer to heal. See a doctor if a wound becomes swollen, red and more painful, has pus in it, or you feel unwell with a high temperature.

How long should a small wound take to heal?

The four stages of healing

Wound healing is a normal process in the body. Guo and DiPietro describe four stages that need to happen in the right order and over the right time for a wound to heal well.

The review explains that many factors can interfere with one or more of these stages, which is why healing can be slower in one person, or in one wound, than another.

What is "usual" for a small cut, graze or burn?

England's NHS gives rough timings for everyday injuries:

• Most cuts and grazes can be treated at home and will start to heal in a few days. The dressing can come off after a few days, once the wound has closed.
• Small burns and scalds can often be treated at home and can take around 2 weeks to heal.

These are general timings, not a deadline. A graze on the knee and a deep cut on the hand will not heal at the same speed, and the same wound can take longer in an older person.

Is a slow-healing wound a sign that something is missing from my diet?

Many things affect how fast a wound heals

The table lists the factors named in Guo and DiPietro's review, with what you can notice in daily life or tell your doctor.

Why the wound alone cannot tell you what is missing

Since nutrition sits alongside so many other factors, looking at a slow wound cannot show whether the cause is food, a medicine, poor blood flow, germs, stress, smoking or a health condition that has not yet been found. Guessing may mean the real reason is missed. A doctor can look at the wound, ask about your health, medicines and habits, and check with a blood test if needed.

Do wounds heal more slowly as we get older?

Thinner skin, slower healing

The National Institute on Aging explains that skin changes with age: it becomes thinner and loses fat. It says scratches, cuts or bumps can take longer to heal, and that older people may bruise more easily and their bruises can take longer to heal. Because older skin is thinner, scratching can cause bleeding that may lead to germs getting in, so the NIA advises talking to a doctor if your skin is very dry and itchy.

Slower, but still working

A 2024 review of ageing skin by Kremer and Burkemper says that wound healing in older people is delayed but not defective. It adds that poor healing of long-lasting wounds in older people is more often linked to other health conditions than to age alone. In other words, if an older parent's wound is very slow, it is worth asking a doctor to look for a reason rather than putting it down to age.

Skin tears are common in older people

Thin skin can tear with a small knock. A 2024 analysis of 13 studies by Yang and colleagues found that, overall, 6.0% of older adults had a skin tear at the time they were checked, and 11.0% of those living in long-term care. The summary gives figures for Europe, Japan and Canada but none for Thailand, so the figures give a general picture only.

What kinds of wounds do older Thai people get at home?

What Thai studies found

What these numbers can and cannot tell us

The Surat Thani study covered people in their 60s in one province, and injuries and treatment were reported by the people themselves. The Udon Thani study counted only people admitted to one hospital's burn unit, so it shows serious burns, not the small burns treated at home. Neither study measured how fast wounds healed. Within their own limits, bruises and scrapes after falls were common in the Surat Thani study, about a quarter of those who fell there did not treat their injuries at all, and most burns admitted to the Udon Thani hospital came from accidents at home.

Why this matters for slow healing

If an older parent treats a scrape themselves or does not treat it, nobody may notice when it is healing more slowly than it should. Asking to see a wound is a simple way for family to help. For making the home safer against falls, see My older parent is afraid of falling. How can we help?

How should I look after a small cut, graze or burn at home?

Cuts and grazes

The NHS describes these steps for a small wound once the bleeding has stopped:

1. Wash and dry your hands, and wear disposable gloves if you have them.
2. Rinse the wound with bottled or tap water, or use sterile wipes.
3. Pat the area dry with a gauze swab or a clean cloth.
4. Clean the skin around the wound with soap and water, wiping away from the wound.
5. Put on a sterile dressing or a plaster, and keep it clean and dry, changing it as often as needed.

If a wound is bleeding, the NHS advises pressing on it with a bandage or a clean folded cloth and raising the injured part. If something is stuck in the wound, do not pull it out.

Burns and scalds

The NHS advises holding a burn or scald under cool running water for 20 minutes, as soon as possible and within 3 hours. Remove clothing or jewellery near the area, but not anything stuck to the skin. Once the burn has cooled, lay cling film over it without wrapping it round. Do not put creams, oils or butter on a burn, do not cover it with plasters or sticky dressings, and do not burst blisters.

What does a balanced day of meals look like?

This section is a general guide to everyday eating for anyone, not a diet for wounds. A column in Ramathibodi Hospital's @Rama magazine describes the 2:1:1 plate recommended by the Thai Health Promotion Foundation: on a 9-inch plate, half is vegetables, a quarter is rice or other starches (no more than 2 ladles) and a quarter is low-fat meat, fish, eggs, soybeans or tofu. For more on covering the food groups when you eat alone or buy most meals, see Living alone with patchy meals: how can I cover food groups?

When should I see a doctor about a slow-healing wound?

See a doctor soon if

The NHS advises asking for an urgent appointment with a doctor if:

• a cut is swollen, red and getting more painful, or pus is coming out of it
• a wound has soil, pus or body fluids in it, or is still dirty after cleaning
• you were bitten by a person or a wild or stray animal
• a cut is larger than about 5 cm
• you have a cut and also feel generally unwell or have a high temperature

Also see a doctor if a wound does not seem to be healing the way small wounds usually do, especially if you are older, see a doctor regularly for a health problem or take regular medicines. The NIA advises checking your skin often and seeing a doctor about any changes that worry you. The NHS advises bringing any medicines you take with you when you go to an emergency department, and a list of the health products you use helps at any appointment.

Call 1669 straight away if

The NHS says the following need emergency care (999 or A&E in England). In Thailand, call the 1669 emergency medical number:

• you cannot stop the bleeding, or blood spurts out
• you lose feeling near the wound or have trouble moving it
• there is a bad cut on the face or the palm of the hand
• the wound is very large or deep, or something is stuck in it
• a burn is very large or deep, is on the face, genitals or bottom, or was caused by a chemical or electricity