Who Is Not a Candidate for a Hair Transplant?

You are usually not a good candidate for a hair transplant if you have too little donor hair, diffuse thinning across the whole scalp including the back and sides, an active scarring alopecia, active alopecia areata, very rapid hair loss at a young age, certain uncontrolled medical conditions, or expectations that your donor supply cannot meet. Some of these are permanent reasons; others mean "not yet".

At Hair Transplants London we turn people down when surgery is not in their interests, and we explain the alternatives.

What disqualifies you from a hair transplant?

No single factor disqualifies everyone, but the most common reason surgeons decline is donor supply. A transplant redistributes your own hair. If the donor area at the back and sides is thin, or if you need far more grafts than it can give without looking thin, surgery may not give you a worthwhile result. Diagnosis is the next most common reason: some types of hair loss do not respond to surgery or can damage transplanted hair.

Estimate your own graft count and typical London price with our hair graft calculator.

Is there a minimum amount of donor hair?

There is no fixed number, but surgeons look at donor density (grafts per square centimetre), the size of the safe donor zone, hair calibre and how the donor area responds to magnified examination. Most men have a lifetime FUE donor capacity of somewhere around 4,000 to 7,000 grafts, but some have much less. If the area you want treated needs more than you can safely give, a surgeon may suggest treating only the front, using fewer grafts at a lower density, or not operating.

Can you have a hair transplant with diffuse thinning?

Usually not if the thinning is diffuse and unpatterned, meaning it affects the back and sides as well as the top. In that case the donor hair is also vulnerable, and transplanted hair may thin too. This pattern is more common in women but also occurs in men. Medical treatment is usually the better route. Our guide to hair transplants for women explains how women's hair loss differs.

Can you have a hair transplant with alopecia areata?

Generally not while it is active. Alopecia areata is an autoimmune condition that causes patchy loss. Hair often regrows by itself, and the condition can affect transplanted hair. It is usually treated medically. If it has been inactive for a long time, a specialist may consider surgery in limited circumstances.

Can you have a hair transplant with scarring alopecia?

Not while the condition is active. Scarring (cicatricial) alopecias, such as lichen planopilaris and frontal fibrosing alopecia, cause inflammation that destroys follicles and can destroy transplanted ones too. Some surgeons will consider a cautious test session after a long period of stability confirmed by a dermatologist, but results are less predictable.

Are you too young for a hair transplant?

You can be. Men in their early 20s with rapidly progressing loss are often advised to wait, because it is hard to predict how far the loss will go. A transplant placed at the hairline at 21 can end up as an isolated island if the hair behind it is lost by 30. Many surgeons prefer to wait until the pattern is clearer, often the mid-20s or later, and to use medical treatment in the meantime. Our guide to the best age for a hair transplant covers this in detail.

Which medical conditions can stop you having a hair transplant?

Your surgeon will review your health. Conditions that may need to be controlled first, or that may make surgery unsuitable, include:

• Bleeding or clotting disorders, or anticoagulant medication that cannot be safely paused.
• Poorly controlled diabetes, which affects healing and infection risk.
• Uncontrolled high blood pressure.
• Some heart conditions.
• Allergies to local anaesthetics.
• Active scalp infections or skin conditions in the donor or recipient area.
• Conditions or medicines that affect wound healing.

Being honest about your health and medication at assessment keeps you safe.

Does smoking stop you having a hair transplant?

Not usually, but it increases the risk of healing problems. Most clinics advise stopping smoking for a period before and after surgery. Ask your clinic for its advice.

What counts as unrealistic expectations?

A good consultation should leave you with a realistic picture of what is possible.

What if you are not a candidate now?

Being turned down is not always permanent. If your hair loss is temporary, it may recover. If your pattern is still changing, medical treatment and a review in 6 to 12 months may clarify things. If a medical condition is controlled, surgery may become possible. Our guide to whether a hair transplant works explains what affects results.

What are the alternatives if you cannot have a transplant?

• Medical treatment, such as minoxidil, or prescription treatments for some men, discussed with a doctor.
• Scalp micropigmentation, a cosmetic tattoo that gives the appearance of short hair or density.
• Hair systems and toppers.
• Styling changes, including shorter cuts.

Find out if you are suitable

An examination by a doctor is the only way to know. Request a hair assessment through our online form, in person or starting by video. We will explain whether surgery is suitable, what it would cost and what else you could consider. London prices typically range from about £3,199 for a package to £11,900 for a large session, as set out in our cost guide.

Frequently asked questions

Related guides

• Hair Transplant Cost UK: Prices per Graft and Package (2026)
• Hair Transplant Recovery Timeline: What to Expect
• DHI vs FUE vs FUT: Which Hair Transplant Method Is Better?
• Harley Street Hair Transplant Cost: What to Know Before You Book
• Hair Transplant for Women in the UK: Suitability, Cost and Alternatives
• Hair Graft Calculator: How Many Grafts Do I Need?
• Hair transplants in London: FUE, DHI and FUT
• Areas of London we cover