5 Surprising Reasons Straight Hair Turns Curly and Frizzy

Selah Vaughn
April 7, 2025

Question from a reader:

Cindy, I’ve always been known for my sleek, pin-straight locks that required minimal fuss. But recently, after years of predictable behavior, my hair has thrown me a curveball — it’s taken on a life of its own, becoming frizzy with a curly texture I’ve never dealt with before. Could this sudden change be a result of my environment, or perhaps an indicator of underlying changes going on in my body?

Wendy Petulla
Eugene, Oregon

Hi Wendy, there are a few reasons why your straight hair might become frizzy or start to curl:

  • It could be from medication. If your hair has taken a sudden change in texture it could be related to a change in medicines. If you have not changed any medications another reason could be from going gray.
  • Graying hair. Gray hair has a tendency to be more coarse and wiry. This could result in frizzy, curly hair that you are not used to dealing with.
  • Major life change or stress. Believe it or not, stress and a traumatic experience can affect our hair and how it grows. Having a baby is a common cause for hair texture to change as well.
  • Change in hormones. Another reason hair can go from straight to curly or frizzy is due to your hair texture changing over time. Our body and hormones change over time and this change can result in a change in hair texture.
  • Steps You Can Take To Help with Frizzy Hair

    If you suddenly notice frizzy hair, even though it wasn’t a problem before, consider updating your hair care routine.

    Try using a shampoo and conditioner designed for frizzy or curly hair. Look for products labeled as hydrating or for hydration. Be cautious with products that have keratin. Too much protein can cause extra frizz and may even damage your hair.

    When blow-drying your hair, make sure to use a heat-protecting spray. It helps smooth your hair and shields it from damage caused by heat tools.

    Finally, use a quality serum or frizz-control oil. Apply it to your hair once you finish blow drying.

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