Hair transplant contraindications: how to tell whether you are eligible

Absolute, relative or temporary: what is the difference?

A hair transplant is a planned procedure, carried out under local anaesthetic, in response to a cosmetic request. The balance between the expected benefit and the risk is therefore judged more strictly than for necessary surgery: anything that makes healing uncertain, bleeding hard to control or the result unpredictable can be enough to postpone the plan.

An absolute contraindication describes a situation in which the operation does not go ahead, whatever the technique, such as alopecia areata during a flare or a donor area too sparse for the plan. A relative contraindication leaves surgery possible provided it is prepared for, with a stabilised condition, adjusted medication or a written opinion from the doctor who treats you. A temporary contraindication clears with time or after treatment, as with a scalp infection or a pregnancy.

No official list applies to every team. A 2025 review in the International Journal of Dermatology points out that comprehensive guidance on the clinical and surgical management of transplant candidates remains limited, so each surgeon combines the published evidence with their own examination. The table below summarises the most common approaches, and your own case is settled during the assessment.

Situation	Usual approach
Alopecia areata flare	No transplant during the flare
Scarring alopecia	Several years of stable disease
Hair loss still progressing	Treatment and time first
Donor area too sparse	Smaller plan or another option
Poorly controlled diabetes	Blood sugar control first
Essential blood thinner	Decision with the prescriber
Suspected body dysmorphia	Specialist opinion first
Smoking	Stop at least 4 weeks before
Pregnancy or breastfeeding	Postponement set by the surgeon
Scalp infection	Treat and heal first

Not every type of hair loss can be transplanted

The follicles used in a transplant come from the rear and sides of the scalp, where the hairs resist the effect of androgens, and are moved to the thinning areas. The procedure therefore suits androgenetic alopecia above all, which makes the diagnosis of your hair loss the first eligibility criterion, ahead of your general health. The NHS describes a hair transplant as suitable for permanent baldness of the kind that runs in families, and not usually for other types of hair loss.

Alopecia areata is the clearest example. A 2024 review in Plastic and Aesthetic Research lists active alopecia areata among the contraindications, because the transplanted hairs can be affected in turn, and notes that surgery can itself trigger a relapse, a risk that falls without disappearing once the condition is quiet. This type of hair loss is first managed medically by a dermatologist.

Scarring alopecias, such as lichen planopilaris, frontal fibrosing alopecia or discoid lupus, destroy the follicle and replace it with fibrous tissue. Transplants give unpredictable results in these conditions, since a flare can occur years after surgery, and several authors only consider one after at least two to five years of stable disease.

Other kinds of hair loss mimic pattern baldness without being the same condition. Telogen effluvium, a diffuse shedding that often follows an illness, childbirth or an emotional shock, only rarely calls for a transplant, since it usually settles on its own, while diffuse unpatterned alopecia, which also thins the donor area, responds better to medical treatment. A misdiagnosed alopecia can even worsen after surgery, and two causes sometimes coexist, such as pattern baldness and a deficiency: each then needs to be identified and stabilised before an operation.

Donor area and progressing hair loss: the limits set by your own scalp

The number of grafts available depends on the donor area, a reserve that does not regenerate once harvested. The 2024 review defines low density as fewer than 60 follicular units per cm² in this area and points out that very extensive baldness, at stages 6 and 7 of the Norwood scale, may have reached the harvesting sites themselves. Hair calibre and texture matter as much as numbers, as our article on the hair transplant donor area explains.

A limited reserve does not always rule surgery out, the same review notes, provided its limits are explained before the operation: the surgeon may then suggest a more targeted plan, for example concentrating on the hairline, or point you towards another option. The plan becomes unworkable when it would need more grafts than the donor area can give up without visibly thinning.

How your hair loss is evolving sets a further limit. Baldness that is still progressing keeps exposing the scalp around the grafts, and some authors advise waiting until 25 to 30 years of age or Norwood stage 3 to 4 before a first transplant, raising the possibility of a second procedure from the first consultation. Medical treatment can slow the hair loss during this time, and the 2024 review advises having taken it for long enough before surgery, since finasteride can take one to two years to reach its full effect. The criteria that apply to younger patients are set out in our piece on the best age for a hair transplant.

General health: how well a condition is controlled matters more than its name

When you live with a long-term condition, the surgeon’s first question is whether it is under control, which weighs more in the decision than the diagnosis itself. Well-controlled diabetes, properly treated high blood pressure or an inflammatory disease in remission do not necessarily prevent surgery, which is then prepared with a few precautions, whereas the same condition poorly controlled leads to the plan being postponed. A 2021 article on patient counselling and the medicolegal aspects of hair transplantation points out that these conditions fall outside the hair transplant surgeon’s remit: the patient is referred to the relevant specialist, who clarifies whether surgery is possible. The return to balance expected before surgery and the tests to provide, for an underactive or overactive thyroid, are set out in our piece on hair transplants with a thyroid condition.

Healing and infection risk

Several situations slow healing or compromise graft survival: diabetes, smoking, corticosteroid use, immunosuppression and some dietary supplements or traditional remedies. The 2024 review recommends controlling them where possible and explaining their consequences to the patient before surgery. Diabetes, with the HbA1c level to aim for and how treatment is adjusted, is covered in a dedicated article on hair transplants and diabetes. If you take semaglutide (Ozempic) or tirzepatide for diabetes or weight management, our article on Ozempic before a hair transplant explains how any pause depends on the planned anaesthetic and who makes that decision with you.

A weakened immune system, whether caused by an illness or by immunosuppressive treatment after an organ transplant, increases the risk of infection. The opinion of the doctor who manages this situation then becomes essential, since only they know how stable the condition is and how much room the treatment leaves. Our article on hair transplants when you live with HIV shows why viral load and CD4 count matter more than HIV status, and points out that antiretroviral treatment continues around the procedure.

Bleeding and blood-thinning medication

The procedure involves a large number of micro-incisions, across both the donor and the recipient areas, which makes clotting decisive. With a bleeding disorder such as haemophilia, or a marked shortage of platelets, the surgeon waits for the opinion of the haematologist who treats you before deciding whether planned surgery remains reasonable.

Long-term blood-thinning treatment, meaning anticoagulants and antiplatelet drugs such as aspirin prescribed after a heart problem, raises a different question. Never stop one of these medicines on your own initiative: any pause is decided with the doctor who prescribed it, who weighs the risk of bleeding against the risk of a clot. The possible scenarios are reviewed in our guide to aspirin and blood thinners before a hair transplant, and herbal supplements, some of which also affect clotting, should be declared in the same way as prescribed medicines.

Heart, blood pressure, liver and kidneys: the specialist’s view

When your medical history reveals high blood pressure, heart disease or a liver or kidney condition, the hair transplant surgeon relies on the relevant specialist, who assesses whether surgery is reasonable and when. High blood pressure and liver or kidney disease also matter during the session itself, as the 2024 review points out that some medicines used in the course of the procedure then need to be used with caution. The blood pressure readings surgeons look for, continuing your treatment and the checks recommended before and during the session are presented in our article on hair transplants with high blood pressure.

After a recent heart attack or stroke, the surgeon sets no date without the agreement of the cardiologist or neurologist, who judges when planned surgery becomes possible. Our article on hair transplants with heart disease goes through coronary heart disease, stents, heart failure and valve disease, along with what to ask your cardiologist and how adrenaline in the anaesthetic acts on a diseased heart. Atrial fibrillation on blood thinners and having a pacemaker or defibrillator are covered in our guide to arrhythmia and hair transplants. The heart tests to plan and the triggers to cut down before the procedure are the subject of our article on hair transplants when you have ectopic beats.

An allergy to local anaesthetics should be mentioned from the first contact. It means using a different product and may justify allergy testing beforehand to confirm that it is tolerated. An antihistamine taken for hay fever or hives should be declared too, and our article on antihistamines and hair transplants explains whether to keep taking it, what changes with drowsy medicines and what role it plays against the itching that follows the procedure.

Scalp conditions, scarring and pigmentation

Seborrhoeic dermatitis or scalp psoriasis can worsen hair loss or interfere with the procedure, so they need to be brought under control before the transplant. An active infection or inflammation, such as folliculitis decalvans, has to be treated first.

A tendency to form keloid or hypertrophic scars, or to develop dark patches after inflammation, which is more common in darker skin, affects the final appearance. Harvesting grafts one by one (FUE) reduces this risk without removing it, and the risk of keloids with a hair transplant is assessed before a date is set.

Mental health and expectations: an eligibility criterion in their own right

The decision also takes into account what you expect from the procedure. Body dysmorphic disorder, a persistent preoccupation with a physical flaw that is minor or invisible to others, is regarded as a contraindication to planned cosmetic procedures, because dissatisfaction persists despite a good result. A 2025 review of the psychological dimensions of hair transplantation specifies that a positive screening questionnaire leads to an assessment by a mental health professional before any decision, without excluding the patient on its own. Screening and support for this condition are discussed in more detail in our article on hair transplants and body dysmorphic disorder.

Trichotillomania, a compulsive urge to pull out one’s own hair, and severe depression also call for a specialist opinion before a transplant is considered. The months after surgery require patience, since the transplanted hairs fall out in the first weeks before gradually growing back, and a stable mood helps you through this period.

Unrealistic expectations, finally, lead to foreseeable disappointment, whether the hope is to regain the density of your twenties across extensive baldness or for the operation to transform your social life. The surgeon explains what your donor reserve can achieve, sometimes with a simulation that remains an idealised projection. It is also their role to discourage someone who requests a transplant for hair loss that is barely noticeable.

Smoking, pregnancy, infection: when surgery is postponed

Smoking is among the factors that slow healing, and the effect of stopping has been measured. A 2025 meta-analysis of 55 studies in the Journal of Clinical Anesthesia, covering all types of surgery, links stopping at least four weeks before an operation with a 33% lower risk of wound complications compared with continuing to smoke. For a transplant, the aim is therefore to stop several weeks before you travel, then not to start again while the scalp heals, following the clinic’s instructions.

Alcohol, like smoking, is among the things the 2024 review advises avoiding during the first one to two weeks after the procedure. If you drink regularly, include this in your medical information, and the surgeon will tell you what to do in the days before the operation.

During pregnancy or breastfeeding, the surgeon postpones the procedure and agrees with you when the plan can be reviewed. Childbirth is one of the events that can trigger a telogen effluvium, and this shedding, which usually settles on its own, is reassessed once it has passed, before any decision about a transplant.

An ongoing infection, a wound or an inflammatory flare on the scalp, a fever or a recent health problem also lead the surgeon to push the date back until full recovery. Since a hair transplant is never urgent, this delay costs little compared with the risk it helps avoid.

The pre-operative assessment, step by step

Before you travel, our team collects your photographs and the medical information the surgeon needs. This information covers the history of your hair loss (age at onset, speed, treatments already tried), past illnesses and operations, allergies and all your medication, including supplements and products applied to the scalp. Photos of the front, top, crown and back of the head, taken in neutral light, give a first estimate of the donor area.

If you live with a long-term condition, include your recent results and a letter from the doctor who treats you, stating how stable the condition is and which treatment you take. This letter saves back-and-forth and allows the surgeon to request an additional test, if needed, before setting a date.

At the clinic, the scalp examination confirms or corrects this first estimate: density and calibre of the donor hair, signs of inflammation and the pattern of hair loss. Scalp dermoscopy, or trichoscopy, helps distinguish pattern baldness from another alopecia, and a biopsy is discussed when the diagnosis remains uncertain. Blood tests depend on the clinic’s protocol and your medical history. In women whose hair loss resembles pattern baldness, the 2024 review advises considering a full blood count, thyroid tests and iron studies.

One last criterion is checked throughout these exchanges: your ability to follow the aftercare. The same review links poor adherence to post-operative instructions or maintenance treatment with lower graft survival. Once eligibility is confirmed, preparation, the session itself and the first weeks are described in our practical hair transplant guide.

The surgeon’s role: accepting, postponing or declining

The final decision rests with the surgeon, after reviewing your file and examining your scalp. The 2025 review on the psychological dimensions of hair transplantation describes this role as that of a gatekeeper as much as an operator: the surgeon informs, corrects misconceptions and, when necessary, delays or declines surgery to protect the patient. The 2021 article cited above describes a consent protocol in which the option of doing nothing is always among the choices presented.

A postponement comes with a specific reason and a goal, such as a condition to stabilise, a treatment to balance or several months of medical therapy to see how the hair loss evolves. This delay produces comparable evidence, new photographs taken from the same angles or follow-up blood tests, on which the plan is reassessed.

A definitive refusal concerns situations that cannot be corrected, such as an alopecia that remains active or a donor reserve too small for the result you want. It preserves a reserve of follicles that does not regenerate and leaves other options open, such as medical treatment or scalp micropigmentation. The possible complications of an accepted procedure, and the points to check about the team that operates, are set out in our analysis of whether a hair transplant in Turkey is safe.

Preparing your request with Body Expert

Your request starts with sending your photos and this medical information to our team. You then receive a free quote within 24 hours, with no obligation, and the surgeon may ask at this stage for an additional test or your doctor’s opinion when your file includes a long-term condition or a treatment to adjust.

In Istanbul, an English-speaking patient coordinator stays with you from start to finish, VIP transfers cover every journey between the airport, the 5-star hotel and the clinic, and the scalp examination on site allows the surgeon to check your eligibility before the procedure. Our page on hair transplants in Istanbul walks through the stay, from arrival to the first wash.

The 12-month post-operative follow-up, carried out remotely, takes over as soon as you are home: photos and questions reach the team throughout regrowth. If your plan has been postponed, you can send new photos and results to our team once the situation has been corrected, for a fresh opinion.

Sources

Brinks, A. L., Needle, C. D., Kearney, C. A., Singh, M., Carreño, N., Osei-Tutu, A., Suri, R., Corralo, D. S., Rogers, N., Vañó-Galván, S., Washenik, K., Shapiro, J., & Lo Sicco, K. I. (2025). Hair transplant: Patient candidacy, medical optimization, and surgical considerations. International Journal of Dermatology, 65(2), 245-256. https://doi.org/10.1111/ijd.17961

NHS. (2023, September 29). Hair transplant. https://www.nhs.uk/tests-and-treatments/cosmetic-procedures/cosmetic-surgery/hair-transplant/

Sattur, S. S., & Sattur, I. S. (2021). Patient counselling and medicolegal aspects of hair transplant surgery. Indian Journal of Plastic Surgery, 54(4), 441-445. https://doi.org/10.1055/s-0041-1739250

Tan, I. J., & Jafferany, M. (2025). Psychological dimensions of hair transplantation: A narrative review of current evidence. Journal of Cosmetic Dermatology, 24(10), e70475. https://doi.org/10.1111/jocd.70475

Tan, M., Yong, A. A., & Wang, E. C. E. (2024). Hair restoration surgery: Pre-surgical considerations and pitfalls. Plastic and Aesthetic Research, 11, 30. https://doi.org/10.20517/2347-9264.2023.138

Tang, E., Rodriguez, R. M., Srivastava, A., Malhan, R., Laksono, I., Yan, E., Englesakis, M., Wong, J., & Chung, F. (2025). Impact of short duration smoking cessation on post-operative complications: A systematic review and meta-analysis. Journal of Clinical Anesthesia, 106, 111967. https://doi.org/10.1016/j.jclinane.2025.111967