Chemical relaxers can straighten hair fast, but the same process that loosens your curl pattern can also weaken your hair and irritate your scalp.
Key Takeaways:
- Relaxers straighten hair by breaking down its internal structure, and that change is permanent for the hair that’s already grown in.
- Relaxers can weaken hair, irritate or burn the scalp, and in some cases contribute to hair loss, including traction alopecia.
- No-lye relaxers use different chemicals than lye relaxers, but they are not automatically the gentler option.
- Professional application, correct timing, and giving your scalp a rest between treatments can all help lower your risk of damage.
What do oven cleaners and chemical hair relaxers have in common? Both often contain lye, or sodium hydroxide, a strong alkaline chemical. Relaxers use it, or a similar chemical, to break down the hair’s natural curl pattern and leave it straight. Used incorrectly, that same chemical process can damage your hair and scalp, and in some cases, contribute to hair loss.
Many people notice the effects weeks or months after a relaxer treatment: more hair in the shower or brush, a thinning hairline, or a scalp that still feels irritated long after the appointment. This guide covers how relaxers work, why they’re linked to hair loss, and what you can do to protect your hair and scalp.
How Chemical Relaxers Work
Chemical relaxers straighten hair by first penetrating the cuticle, the hair’s outer protective layer, and reaching the cortex underneath. Inside the cortex, the relaxer breaks the disulfide bonds that give hair its natural curl pattern. Once those bonds are broken, the hair is chemically reshaped into a straight position.
This change is permanent for the hair that’s already grown in. Only new hair growing from the follicle keeps its natural texture, which is why relaxed hair typically needs a root touch-up every 8 to 10 weeks as new growth comes in.
Relaxers rely on strong alkaline chemicals to do this work, most often sodium hydroxide, guanidine hydroxide, or calcium hydroxide. These ingredients raise the hair’s pH, open the cuticle, and weaken the hair strand, which is why chemically straightened hair tends to be more prone to dryness and breakage than untreated hair.
Why Relaxers Can Be Linked to Hair Loss
Relaxers don’t cause hair loss for everyone who uses them, but the chemical process behind them creates several ways it can happen:
- Weaken the hair shaft, making strands thinner and easier to snap
- Irritate the scalp or cause chemical burns, especially with prolonged contact or high heat
- May damage hair follicles, which can slow regrowth
- Can trigger traction alopecia, a type of hair loss caused by tension, when tight styling is combined with chemically weakened hair
In some cases, repeated chemical burns or ongoing scalp inflammation can cause lasting damage, and in rare cases has been associated with scarring conditions like central centrifugal cicatricial alopecia (CCCA). A dermatologist or hair loss specialist can help determine the exact cause of hair loss, so it’s worth getting a proper evaluation if symptoms don’t improve on their own.
This is worth taking seriously for anyone who relaxes their hair regularly, and particularly for Black women, who are statistically more likely to start using relaxers at a young age and to use them consistently over many years.
Lye vs. No-Lye Relaxers: What's the Difference
Not all relaxers use the same chemistry, and neither type is automatically the safer choice.
Lye relaxers use sodium hydroxide. They work quickly and are effective on tightly curly or coily hair, but they can burn the scalp if left on too long or applied incorrectly.
No-lye relaxers typically combine guanidine carbonate and calcium hydroxide, which react to form guanidine hydroxide, the ingredient that actually does the straightening. They’re often marketed as gentler, but they can leave mineral buildup that dries out hair and contributes to breakage.
Because both types use strong chemicals, it’s best to have relaxers applied by a trained professional rather than at home.
How to Protect Your Hair and Scalp During Relaxer Treatments
According to the U.S. Food and Drug Administration (FDA), most relaxer side effects come down to improper use, which means a few precautions can meaningfully lower your risk:
- Have an experienced professional apply the treatment whenever possible
- Never apply relaxer to unhealthy hair or an already irritated scalp
- Don’t leave the relaxer on longer than the recommended time, and remove it at the first sign of tingling or burning
- Coat your scalp with a base of petroleum jelly before application to help protect it from chemical burns
- Avoid coloring and relaxing your hair in the same session; the combination of lye and peroxide can severely damage both hair and scalp
- Wait several months between chemical services if your hair is already brittle, breaking, or color-treated
Once your hair is relaxed, it needs extra attention to stay strong. Deep condition weekly to replace lost moisture, limit heat styling tools like flat irons and blow dryers, and avoid tight braids or ponytails that pull at the hairline, which over time can lead to traction alopecia.
Signs Relaxers May Be Damaging Your Hair or Scalp
Watch for these warning signs after a relaxer treatment:
- More hair than usual in the shower or on your brush
- A thinning hairline or crown
- Burning, itching, or bumps on the scalp
- Slow or uneven hair growth
- Smooth, shiny patches on the scalp
These signs shouldn’t be ignored. If you notice any of them, stopping relaxer use and having your hair and scalp evaluated can help prevent further damage.
Why HairClub Is the Expert
Hair loss linked to chemical relaxers isn’t one-size-fits-all, and neither is the right way to address it. At HairClub, every plan starts with a free, private hair and scalp analysis, a magnified look at your follicles that helps a Certified Hair Loss Specialist tell healthy hair from thinning or damaged hair.
From there, your specialist builds a personalized plan drawn from HairClub’s full range of solutions, from prevention and regrowth options to non-surgical hair replacement and surgical hair restoration, based on your hair type, history, and goals. HairClub has helped more than 500,000 clients since 1976 through over 100 centers across the U.S., Canada, and Puerto Rico.
FAQs About Chemical Relaxers and Hair Loss
Do relaxers cause permanent hair loss?
They can, especially with repeated use. Chemical burns or ongoing scalp inflammation may damage hair follicles, and in some cases the damage can be permanent. A hair loss specialist can help you understand what’s happening with your specific hair and scalp.
Can relaxed hair grow back healthy?
Often, yes. With proper hair care, reduced chemical use, and the right treatment plan, new hair can grow in stronger. How much hair recovers depends on how much follicle damage has occurred.
Are no-lye relaxers safer than lye relaxers?
Not necessarily. No-lye relaxers use different chemicals, mainly guanidine carbonate and calcium hydroxide, but they can still dry out hair and irritate the scalp. Both types should be used carefully and ideally applied by a professional.
Should I stop using hair straightening products?
If you notice thinning, scalp pain, or other warning signs, pausing relaxer use can help prevent further damage while you figure out the cause.
How do I know if I should see a specialist about relaxer damage?
If shedding, thinning, or scalp irritation doesn’t improve within a few weeks of stopping relaxer use, it’s worth having a professional take a closer look.
Protect Your Hair Health
If you’re seeing shedding, thinning, or scalp discomfort after using chemical relaxers, you don’t have to guess at what’s next. Book a free, private consultation with a HairClub Certified Hair Loss Specialist to get a personalized hair and scalp analysis and a plan built around your goals.
