Hello, I'm an expert in the field of hair science and have been studying the various factors that can influence hair texture and quality for many years. I'd be happy to share my insights on what causes straight hair to become curly.
There are several factors that can contribute to changes in hair texture, including hormonal changes, stress, and aging. Let's take a closer look at each of these factors:

1. Hormonal Changes: Hormones play a significant role in regulating hair growth and texture. During puberty, there is a surge in hormone production, which can lead to changes in hair texture. For example, an increase in androgens (male hormones) can cause hair follicles to become more curved, resulting in curly hair. This is because the shape of the hair follicle determines the shape of the hair shaft. Straight hair follicles grow straight out, while curly hair follicles have a hook shape.

2. Stress: Stress can also impact hair texture. When the body is under stress, it produces a hormone called cortisol. High levels of cortisol can interfere with hair growth and cause hair to become more brittle and prone to breakage. In some cases, stress can even lead to a condition called telogen effluvium, where hair falls out in large amounts, resulting in thinning or bald patches.

3. Aging: As we age, our hair tends to become thinner and more brittle. This is due to a decrease in the production of oils and nutrients that keep hair healthy. Additionally, the hair follicles may become weaker and less able to produce new hair, leading to a change in hair texture. For example, some people may notice that their hair becomes curlier as they get older.

In addition to these factors, there are other factors that can contribute to changes in hair texture, such as genetics, diet, and hair care practices. For example, certain hair care products can cause hair to become more curly or wavy, while others can make it straighter. Similarly, a diet that is lacking in essential nutrients can lead to changes in hair texture and quality.

It's important to note that changes in hair texture can be a normal part of the aging process and may not necessarily indicate a health problem. However, if you notice sudden or significant changes in your hair texture, it's a good idea to consult with a healthcare provider or a hair care professional to rule out any underlying health issues.

In conclusion, there are several factors that can cause straight hair to become curly, including hormonal changes, stress, and aging. Understanding these factors can help you take steps to maintain healthy hair and prevent changes in hair texture. By adopting a balanced diet, managing stress, and using gentle hair care products, you can help keep your hair looking its best.

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Hormones, stress and ageing as seen as the common causes for changes to your hair texture and quality. ... Straight hair follicles grow straight out but curly hair follicles have a hook shape. With my hair, puberty was the when my curls decided to appear and this fits with the hormone changes.Jul 11, 2014read more >>