Hair Transplant Side Effects, and When to Call the Clinic

The usual side effects of a hair transplant are soreness, swelling, scabbing, some numbness and the expected shedding of transplanted hairs in the weeks after surgery. Less often, people have infection, inflamed follicles, lasting numbness, poor growth, visible scarring or a thinned donor area, and a few signs mean you should call your clinic the same day.

This guide separates the expected from the concerning. It is general information, not a substitute for your surgeon's aftercare instructions or medical advice about your own recovery. For the procedure itself, see our main guide to what a hair transplant is and the risks it carries.

What is normal in the first two weeks

Most of what people notice in the first fortnight is part of normal healing. Expect soreness and tightness, some swelling, small scabs where grafts were placed and extracted, and itching as things heal.

The American Society of Plastic Surgeons (ASPS) says aching, tightness and throbbing can be controlled with pain medication prescribed by your physician, and that bandages, if used, usually come off after a day. The International Society of Hair Restoration Surgery (ISHRS) says the small scabs of FUE usually clear in about one to two weeks. Stitches after strip harvesting come out in a week to 10 days, according to the ASPS.

Shedding: normal, and alarming

Transplanted hairs usually fall out two to eight weeks after surgery, and the American Academy of Dermatology (AAD) calls this normal. The follicle stays and regrows. Some people also shed nearby native hair, known as shock loss, which is usually temporary.

Both are expected parts of recovery, but they are among the most distressing. Our guide to shock loss after a hair transplant explains the difference between the two.

Complications reported in the medical literature

A 2025 scoping review of complications in modern hair transplantation, by Liu and colleagues in Aesthetic Plastic Surgery, summarised what studies report. It concluded that serious complications are rare in the hands of experienced providers, and that any complication of an elective procedure can matter a great deal to the person affected.

The complications it listed across studies include:

• Bleeding that needs attention beyond gentle pressure.
• Infection of the donor or recipient area.
• Swelling of the forehead in the days after surgery.
• Crusting in the recipient area.
• Sterile folliculitis, inflamed bumps around follicles without infection.
• Numbness, which is often temporary but can persist.
• Shedding at donor and recipient sites.
• Raised or keloid scarring after strip harvesting.
• Rare serious infections, which are uncommon but reported.

Reported rates differ so much between studies that we don't print them. Your surgeon should explain which risks apply most to your procedure and how they would be managed.

Problems that show up later

Some issues only become clear months after surgery, once hair has had time to grow. These are not emergencies, but they are worth raising with your surgeon.

Poor growth. The ASPS lists grafts that fail to "take" among transplant risks. Judge growth at the points sources give for results: the AAD says most patients see results between six and nine months, and some take 12.

Unnatural appearance. Hairlines placed too low or too straight, or hair growing in the wrong direction, are among the problems the ISHRS describes in repair work.

A thin donor area. Over-harvesting can leave the back of the head looking thin and cannot be reversed. Our guide to the donor area and over-harvesting explains why.

Progressing loss around the transplant. The AAD notes hair loss can continue after a transplant, and the ASPS warns this can make results look patchy.

When to call your clinic today

Some signs should not wait for a scheduled review. Contact your clinic the same day, or seek urgent medical care if you can't reach them, if you notice:

1. redness that is spreading, or warmth and swelling that are increasing rather than settling
2. pus or a bad-smelling discharge from the donor or recipient area
3. fever or feeling generally unwell
4. bleeding that does not stop with gentle, steady pressure
5. pain that is getting worse instead of better
6. swelling that affects your vision or breathing

These can indicate infection or bleeding that need prompt treatment. If you had surgery abroad, find out before you travel who will see you at home if something goes wrong, because that is when you'll need them.

When to raise it at your next review

Other concerns are worth recording and raising at your next appointment, or sooner if they worry you. These include lasting numbness, bumps or cysts, scars you can see with your usual haircut, patchy growth after the months when results normally show, and shedding that seems to spread beyond the treated area.

Photos help a great deal. Take them in the same light, at the same angles, at regular intervals, so you and your surgeon can compare like with like. Our month-by-month hair transplant timeline shows what is normal at each stage.

Reducing your risk before surgery

The most effective way to reduce risk happens before the operation: choosing who operates. The ISHRS urges patients to confirm that the doctor performs the surgery rather than delegating it to an unlicensed technician, and its Fight the FIGHT campaign lists scarring, poor growth, wrong hair direction, a depleted donor area and infections among the problems it sees from black-market clinics.

Other steps help too: getting a diagnosis first, being honest about your health and medicines, following aftercare instructions exactly, and planning for follow-up care. A GP or dermatologist visit and the ISHRS Find a Doctor directory are both good starting points, and neither pays us anything. What happens when things do go wrong is covered in hair transplant gone wrong: repair and the technician problem.

Side effects of FUE and FUT compared

The two harvest methods share most side effects in the recipient area, but they differ at the back of the head. The difference is mostly about the kind of mark left and the kind of discomfort felt.

FUE leaves many small dot scars across the donor area and, because the area is usually shaved, the healing is visible for a while. The ISHRS lists over-harvesting, scalp cysts and mild infections among its risks. FUT leaves one linear scar and a stitched wound; the ISHRS says it can cause more discomfort than FUE for some patients, and the 2025 review lists raised or keloid scarring after strip harvesting among reported complications. Neither is free of side effects, and our FUE vs FUT vs DHI comparison sets out the trade-offs in full.