Is hair loss genetic? What family history can and cannot tell you

"It comes from your mother's father" is one of the most repeated beliefs about baldness. Like many popular ideas, it contains a grain of truth but is far from the whole picture. Here is what science says about genes and hair loss.

Yes, pattern hair loss is largely genetic

The most common type of hair loss in both men and women is androgenetic alopecia, known as male pattern baldness in men and female pattern hair loss in women ¹. Its development depends on an interaction between hormones and genetic predisposition ².

In men, hair is typically lost above both temples, with the hairline gradually forming an M shape, and thinning at the crown. In women, the hair becomes thinner on top and the middle parting widens, while the front hairline usually stays in place ¹.

The condition tends to run in families, and having a close relative with pattern hair loss appears to be a risk factor ¹.

Mother's side or father's side?

The answer is: both.

• One of the best-confirmed genes is the AR gene, which provides instructions for the androgen receptor, the protein that lets hair follicles respond to DHT and other male hormones. Variations in this gene appear to make the receptors more easily stimulated ¹
• The AR gene sits on the X chromosome. Men inherit their only X chromosome from their mother, which is where the "mother's side" idea comes from ²
• But a second major risk area is on chromosome 20, which is inherited from both parents ²
• A 2025 review reported that genome-wide studies have now linked more than 380 regions of the genome to pattern hair loss ³

In other words, pattern hair loss is polygenic, meaning many genes each contribute a small effect. DermNet notes that susceptibility genes are inherited from both mother and father ⁴. So your father's hair, your mother's father's hair and your other relatives all give useful clues, but none of them can predict your future exactly.

Why siblings can differ

Because so many genes are involved, brothers and sisters can inherit different combinations. That is why one brother may thin in his 20s while another keeps a full head of hair into his 50s. Pattern hair loss also varies widely in its age of onset, severity and distribution ³.

Ancestry matters too

How common pattern hair loss is varies between populations. A 2025 review described substantial differences in androgenetic alopecia between ancestral groups ³. DermNet notes that East Asian men, such as Japanese and Chinese men, are generally less affected than men of European descent ⁴. In multi-ethnic Malaysia, this means comparing yourself with friends from different backgrounds may not tell you much.

Can a genetic test predict hair loss?

Not reliably. DermNet states that genetic testing to predict balding is currently unreliable ^{4 5}. Be cautious of companies selling DNA tests that claim to predict your hair loss risk or choose treatment for you.

Genes are not the whole story

Genetic risk does not mean nothing can be done:

• Hormones: in men, DHT is a key driver. Medicines that lower DHT, such as finasteride, can slow pattern hair loss ⁶. See DHT and hair loss
• Lifestyle: research has linked early-onset pattern hair loss with smoking, unhealthy diet and high body mass index ⁷
• Other causes: shedding from illness, stress, low iron or thyroid problems can add to genetic thinning, and these can often be treated. See sudden hair fall

Is all hair loss genetic?

No. Many types of hair loss are not inherited in this way:

• Telogen effluvium: temporary shedding after illness, childbirth, stress or dieting
• Alopecia areata: an autoimmune condition that causes patches. It can run in families, but works differently. See alopecia areata
• Traction alopecia: caused by tight hairstyles
• Scalp infections and inflammation: such as ringworm of the scalp

What this means for you

• If pattern hair loss runs in your family, watch for early signs, such as a receding hairline, thinning crown or widening parting
• Starting treatment early usually gives the best chance of keeping hair. Effective options include topical minoxidil, finasteride for men and hair transplantation ³
• A family history does not mean you will definitely go bald. Many people with balding relatives keep much of their hair

The bottom line

Pattern hair loss is strongly genetic, but it is not inherited only from your mother's side. Hundreds of genetic regions from both parents contribute, together with hormones, age and possibly lifestyle. Genetic tests cannot yet predict who will lose their hair. If you are worried, watch for early signs and see a doctor, because early treatment gives you the most options. See crown thinning and a widening part.

Frequently asked questions

Is baldness inherited from the mother's side?

Partly. A key gene (AR) is on the X chromosome from your mother, but many other genes come from both parents ^{1 2}.

How many genes are involved in hair loss?

A 2025 review reported more than 380 genomic regions linked to pattern hair loss ³.

Can a DNA test predict hair loss?

Not reliably. DermNet says genetic testing for predicting balding is currently unreliable ⁴.

If my father is bald, will I go bald?

Your risk is higher, but it is not certain, because many genes from both sides are involved ^{1 4}.

Educational content. Not medical advice.