Stages of hair loss step by step: the Norwood and Ludwig scales explained

What hair loss is and how common it is

Hair loss, or alopecia, is more than losing strands. In the most common form, the hair follicles gradually shrink, producing ever finer and shorter hairs until some of them stop producing visible hair altogether. In the early stages this process can be slow and easy to miss.

Hair loss affects millions of people worldwide. It can begin at any age, although it becomes more common in men as they get older and in women after menopause.

• In men it usually shows as a receding hairline and thinning at the crown. This pattern is known as androgenetic alopecia.
• In women it usually shows as thinning across the top of the head, while the front hairline is preserved.

Spotting the early signs matters: the sooner the cause is identified, the more options there usually are to slow the process down.

Stages of hair loss in men: the Norwood scale

Male pattern hair loss tends to follow a predictable course. The most widely used system for describing it is the Norwood scale, which has seven main stages:

1. Stage 1. Minimal recession of the hairline at the temples; often no visible change.
2. Stage 2. Slight recession at the temples, forming a shallow M shape.
3. Stage 3. Deeper recession at the temples; in some men thinning at the crown also begins.
4. Stage 4. The crown becomes noticeably thinner, but a band of hair still separates it from the front.
5. Stage 5. The bald areas at the front and the crown grow larger and the band between them becomes narrow and sparse.
6. Stage 6. The front and crown areas merge, and the hair loss extends towards the sides.
7. Stage 7. The most advanced stage: only a horseshoe-shaped band of hair remains around the sides and back of the head.

Knowing the stage helps the doctor judge how fast the process is moving and which approach is realistic. In later stages the donor area has to cover a larger surface, which affects planning if a transplant is considered.

Stages of hair loss in women: the Ludwig scale

Hair loss is more often associated with men, but many women experience it too, and it looks different. Female pattern hair loss is commonly described with the Ludwig scale, which has three stages:

1. Stage 1. Mild thinning on the top of the head, often first noticed as a wider parting.
2. Stage 2. Moderate thinning that becomes clearly visible.
3. Stage 3. Advanced thinning where the scalp on top of the head is easy to see.

Unlike men, women rarely lose all the hair in one area. The loss is usually diffuse, most noticeable in the central part of the scalp. As with men, early assessment makes a difference, so it is worth seeing a specialist as soon as you notice the first signs of thinning.

Common causes of hair loss

Hair loss can be triggered by many factors, from genetics to lifestyle. Understanding them helps the doctor decide what to treat first.

Genetics and hormones

Heredity is one of the main causes: if relatives lost their hair, your own likelihood is higher. Androgenetic alopecia is linked to the effect of male hormones, particularly a derivative of testosterone, on sensitive follicles. In women, menopause, pregnancy and other hormonal changes can also play a part.

Medical conditions

Autoimmune conditions such as alopecia areata can cause sudden patchy hair loss, and thyroid disorders are often associated with thinning.

External factors and lifestyle

• Severe stress may lead to temporary shedding known as telogen effluvium.
• Harsh chemical treatments, frequent colouring and aggressive styling damage the hair.
• A lack of iron, zinc or B vitamins can contribute to thinning.
• Smoking and heavy drinking may impair blood supply to the follicles.

Treatment options depend on the stage

The right approach depends on the type of hair loss, its stage and your general health, so treatment should be chosen by a doctor, usually a dermatologist, after a proper examination. Do not start medication on your own.

In early stages, a dermatologist may suggest prescription treatment to slow the process, and sometimes additional measures such as low-level laser therapy, platelet-rich plasma injections or a tailored scalp care routine. The evidence and the expected effect differ from person to person, which is another reason to decide together with a doctor.

When hair loss has become stable and the bald or thinning areas are clearly defined, a hair transplant may be considered. FUE is used for androgenetic alopecia, and a combined FUE and DHI approach is used for androgenetic alopecia and to add density to thinning areas. Transplanted hair usually grows and behaves like your own hair: it can be cut, coloured and styled. A transplant is not suitable for total alopecia, where there is no donor hair, and it does not stop further loss of the non-transplanted hair, so ongoing care from a doctor is often recommended. More details are on the hair transplant page.

Consultation at City Medical Centre

City Medical Centre works with international patients. The first consultation is free and can be held online: send photos of your hairline, crown and donor area, and the doctor will assess the stage of your hair loss and whether a transplant is appropriate. The cost is named after this assessment and fixed in the contract. A personal coordinator stays with you from your first message to the end of recovery, and photos and questions can be sent by WhatsApp. Find out more on the hair transplant page.

Frequently asked questions

What is the Norwood scale?

The Norwood scale is the most widely used way to describe male pattern hair loss. It has seven stages, from minimal recession at the temples to an advanced stage where only a horseshoe-shaped band of hair remains at the sides and back of the head.

How is female hair loss classified?

Female pattern hair loss is often described with the Ludwig scale, which has three stages: mild thinning on top of the head, moderate thinning that is clearly visible and advanced thinning where the scalp shows through. Women rarely lose all the hair in one area.

At what stage can a hair transplant be done?

There is no single stage. What matters is that the hair loss has become relatively stable and that the donor area has enough healthy hair to cover the thinning zones. The doctor assesses this from photos or an examination and explains what result is realistic.

Can hair loss be stopped at an early stage?

In many cases the process can be slowed, especially when it is caught early and the cause is identified. Treatment should be prescribed by a dermatologist after an examination, as the right approach depends on the type of hair loss and your health.

Does a transplant stop further hair loss?

No. Transplanted hair is taken from the donor area and usually keeps growing, but the original hair around it can continue to thin over time. That is why doctors often recommend ongoing care alongside a transplant.