How Does a Hair Transplant Work? FUE Explained
Last reviewed on 4 August 2026. We review our treatment guides every six months to keep them accurate.
If you have searched for how a hair transplant works, you have probably seen the same operation described in a dozen different ways. At its heart it is simpler than the marketing makes it sound. A hair transplant takes hair you already have from the back and sides of your scalp, where it is genetically programmed to keep growing, and moves it into an area that has thinned or gone bald. The most common way of doing this in the UK is an FUE hair transplant, short for follicular unit excision, and this guide explains, step by step, exactly how the procedure works and whether it is right for you.
The information here follows guidance from the NHS and the International Society of Hair Restoration Surgery. It is general information rather than personal medical advice, so please follow the plan your own surgeon recommends.
Once you understand how the procedure works, the next question is usually price. See what a hair transplant costs in the UK, including cost by graft count and exactly what is included.
Why a hair transplant works: donor dominance
Transplanted hair keeps growing because the follicles taken from the back and sides are genetically resistant to DHT, the hormone that drives pattern hair loss.
To understand how a transplant works, it helps to know why hair is lost in the first place. Male and female pattern hair loss is driven by a hormone called DHT, together with a genetically determined sensitivity to it in only some areas of the scalp. As DermNet explains, this sensitivity gradually miniaturises the hairs on the top and front of the head, while the hair around the back and sides is far less sensitive and tends to keep growing for life.
This is where the founding principle of hair transplant surgery comes in. Described in the 1950s, it is called donor dominance: a hair follicle keeps the characteristics of the area it was taken from, even after it is moved somewhere else. So when a resistant follicle from the back or sides (the donor area) is transplanted into a balding patch, it carries its resistance with it and simply continues to grow. That is the whole reason a hair transplant works, and why the moved hair is considered permanent.
There is one important consequence. A transplant redistributes the hair you already have; it does not create new hair. The permanent donor area is finite, so a surgeon has to plan carefully how much to take and where to place it. How much you need for a given result is covered in the guide to how many grafts a hair transplant needs.
The two ways the hair is taken: FUE and FUT
Every transplant moves natural follicular units; the two methods, FUE and FUT, differ only in how those units are harvested from the donor area.
Hair grows naturally in follicular units, small bundles of one to four hairs. Every modern hair transplant moves these units; the difference between the two main methods is only in how they are harvested from the donor area.
FUE (follicular unit excision) removes the units one at a time. The surgeon uses a small round punch, usually under about a millimetre across, to score around each unit and lift it out with its root, leaving only tiny dot-like marks that heal without stitches. Because it avoids a long cut, the scarring is scattered and hard to see, which is a large part of why the FUE method is now the more common choice in the UK. You may also see it called an FUE procedure, FUE surgery or FUE hair replacement; these all describe the same technique.
FUT (follicular unit transplantation), or the strip method, instead removes a single strip of hair-bearing skin from the back of the head. The wound is closed with stitches, which leaves one thin linear scar, and the strip is then divided under a microscope into individual grafts. FUT can yield a large number of grafts in one sitting, so it still has its place; the trade-off is the linear scar compared with the scattered dots of FUE. Neither is universally better, and the right choice depends on your hair, your goals and your surgeon.
Within FUE there are also named variations that change just one part of the process, such as sapphire FUE (which uses a sapphire blade to make the sites) and DHI (which places the grafts with an implanter pen). These are variations of the same operation rather than different procedures.
How an FUE hair transplant is done, step by step
FUE is a day-case procedure done awake under local anaesthetic, extracting follicles individually and placing them into tiny channels at a natural angle and density.
A hair transplant is a day-case procedure carried out while you are awake. It is usually done under local anaesthetic, sometimes with light sedation, so the scalp is fully numbed and you should not feel pain. A typical FUE procedure runs through the following stages.
Consultation and planning. Before anything is moved, your surgeon assesses whether you are a suitable candidate, checks your donor supply, designs the hairline and agrees the number of grafts. This planning does much of the work in making the final result look natural.
Numbing the scalp. Local anaesthetic is injected into the donor and recipient areas. Once you are numb you stay awake throughout, and many people read, watch something or doze.
Extracting the grafts. The donor area is usually clipped to short stubble, and the surgeon removes the follicular units one by one with the punch. Because the whole follicle including its root is taken, it will not grow back in that spot, so grafts are spread across a wide area to keep the donor looking evenly full.
Making the recipient sites. This is widely considered the most skilled step. The surgeon makes many tiny incisions in the thinning area, judging the angle, direction, depth and spacing of each one, because whatever angle a site is made at is the angle the new hair will grow. Getting this right is what makes the result blend with your existing hair.
Placing the grafts. Finally the grafts are placed into the sites, one at a time, following the natural pattern and direction of your hair. The donor area is then checked and dressed, and you can go home the same day.
How long does a hair transplant take?
Most procedures take several hours and are completed in a single day. A large session moving thousands of grafts can take most of the day, and for very extensive work a surgeon may split it across more than one visit. You are not asleep for any of it, and there is no overnight stay for a standard transplant.
Recovery and results: what happens afterwards
For the first week or two the treated areas may look red, and small scabs form around each graft as the scalp heals. The NHS advises gentle hair washing from around a week after surgery, and most redness and tenderness settle over the following weeks.
A stage that surprises many people comes next. In the weeks after the procedure the transplanted hairs usually fall out. This is normal and expected, and is often called shock loss; the follicle stays safely in place and simply resets. New growth typically begins at around four months, thickens gradually, and reaches its full result at roughly 10 to 18 months. The guide to hair transplant shedding explains this phase in more detail, and if you would rather not clip the donor area, the hair transplant without shaving guide covers the options.
Do hair transplants work, and are they permanent?
Yes. For a suitable candidate, in trained hands, a hair transplant is an established procedure that works, and because the moved follicles keep their resistance to DHT the transplanted hair is considered permanent. That is the honest headline, but it comes with two equally honest caveats.
First, a transplant does not stop pattern hair loss elsewhere. Your original, non-transplanted hair around the grafts can carry on thinning over the years, which is why careful planning matters and why some people are advised to use medication to protect the hair they still have. Second, the donor area is limited, so there is only so much hair to move. For these reasons the outcome depends heavily on the surgeon and the plan, not just the technique. The NHS recommends checking that your surgeon is registered with the General Medical Council.
Frequently asked questions
Do hair transplants really work?
For suitable candidates and in experienced hands, yes. The procedure moves DHT-resistant follicles from the back and sides of the scalp into thinning areas, where they continue to grow. It will not stop ongoing pattern loss in your other hair, so results are best when the surgeon plans for the future rather than just the present.
Is a hair transplant permanent?
The transplanted hair is considered permanent, because a follicle keeps the characteristics of the donor area it came from and those donor follicles are resistant to the hormone that causes pattern hair loss. The native hair around it is not protected, however, and can keep thinning, which is why long-term planning matters.
Does FUE work, and is it better than FUT?
FUE works well and is now the more common method in the UK, mainly because it leaves tiny scattered marks rather than a linear scar. It is not automatically better than FUT for everyone; FUT can move a lot of grafts in one session. Both rely on the same donor-dominance principle, and the surgeon's skill matters more than the label.
Does a hair transplant hurt?
The scalp is numbed with local anaesthetic, so you should not feel pain during the procedure, although the initial injections can sting briefly. Some tightness, aching or swelling for a few days afterwards is normal as the scalp heals.
Will the transplanted hair fall out?
Usually, yes, and this is expected. The transplanted hairs commonly shed in the first few weeks while the follicle stays in place, a stage known as shock loss. New growth generally starts at around four months and builds towards the final result by roughly 10 to 18 months.
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