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Straight To Curly Hair, Curly To Straight – Why Is Your Hair Changing?

Why Is My Curly Hair Going Straight?

Why Is My Straight Hair Going Curly?

Answers Below!


Estimated Read Time: 5 minutes 

Summary: In this blog we detail and explore why your hair may be changing shape! We’ll discuss why straight hair sometimes goes curly and why curly hair sometimes goes straight, and how this can happen. Read on to discover more about hair changing shape and why it can happen…


Have you noticed that your hair is changing…? If you once had waves or ringlets, and you’re asking yourself “Why is my hair not curly anymore?”, you’ve come to the right place. The same if you’re experiencing straight to curly hair! It can be quite alarming for your hair to suddenly change shape or texture, so let’s explore what the reason could be behind your straight to curly hair, or why your curly hair is going straight…

Straight To Curly Hair

Why could you be experiencing straight hair turning curly…?


A change in your hormones, whether due to puberty, pregnancy, giving birth, starting/changing birth control, going through the menopause or conditions like hyper or hypothyroidism can all contribute to a change of texture and shape of hair.

As well as the hormones Thyroxine, Triiodothyronine, and Insulin, particularly associated with a change from straight to curly hair is androgens: the male sex hormones. When an increase of androgens occurs in either sex, due to any of the hormonal shifts mentioned above, this can actually trigger a change of muscular shape in the hair follicle from round to flat. This, in turn, can alter the texture of the hair strand from straight to curly!

It’s worth noting that although less common, these hormonal shifts can also sometimes straighten originally curly hair too.


If you’ve recently gone through a round of chemotherapy as part of your cancer treatment, you may have noticed your hair is growing back curly. Chemo can have an affect on rapidly growing cells in the body, and the hair follicles are included in this. The follicle shape can change temporarily but more often than not, after recovery this will revert back and your straight hair will return.

A Change Of Climate

Have you moved to a different climate recently? Temperate and sun exposure can affect our hormone levels, but it could be a more direct affect of the climate you now live in (or are currently in). A simple increase in humidity can trigger the hair to curl or wave.


Your curl pattern is genetically programmed: just like your eye colour and height. As mentioned earlier, biological changes like puberty and ageing can affect the curl pattern. But, if your heritage is fairly mixed then your hair is going to be more sensitive to change.

For example, people with East Asian heritage will typically have very straight hair and those with African heritage will typically have very curly hair. Because these groups and their genetic heritage isn’t typically as mixed as those of European or West Asian heritage, their hair will be less likely to change shape. In fact, those of African ethnicity will most likely experience curls to become even tighter as they grow older.

Those with a DNA make up of West Asian or European are the most typical groups to experience a change of straight to curly hair as they mature. If you have a mixture of African, European and Asian heritage, you’re even more likely than most to experience a change in your hair’s texture. 

Why Is My Curly Hair Going Straight?


Did you know that your curls can begin to drop or loosen/straighten out as you grow older because of the simple science of gravity – particularly if you have thick hair?

However, you can oppose it’s affects by trying to keep your curly locks hydrated with regular hair masks, using high quality conditioning products, and staying on top of regular trimming (every 6-12 weeks). This will help keep your curls bouncing. Another option is to go bold and opt for a shorter cut overall. This will really make your spirals spring!


As we age, our hair naturally starts to thin. This means our hair is falling further apart from other strands, which usually helps to keep its coiled shape. The growth rate of our hair slows as we get older too.

If you’re healthy, and eating a nutrient-rich, balanced diet and generally looking after your body, you can fend this off if you want to preserve your spiral-like strands.

As we mature, we tend to increase our carbohydrate intake because these foods are usually easier to prepare/eat. But if you want to keep fuelling your curly hair correctly, make sure to keep up with a balance of protein, iron and biotin sourced from leafy greens, eggs, fish and, if you eat it, lean meat. Alternatively, you can look to suitable, hair-targeted supplements to support your hair from the inside out instead.

Related Reads

CGM Hair: Everything You Need To Know About The Curly Girl Method

Common Hair Myths BUSTED!


Science World


Epilator Authority


Trichologist Iain Sallis, via Daily Mail



Sarah Milton

A passionate content writer, with a specific interest in the science behind hair care. Having created content for several years, I’ve grown my knowledge exponentially in the science behind hair growth, quality and texture, and what ingredients our tresses need to thrive. When not in the office, I’m walking my dog along the beach or invested in a brilliant television drama.


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