Why Are Some of My Hairs Thicker than Others?

Have you ever wondered why some of your hairs are thicker than others? As someone who has always struggled with hair thickness, this question has been on my mind for a while. After doing some research, I found out that there are several reasons why this might be the case.

Firstly, genetics play a big role in determining hair thickness. Some people are simply born with thicker hair strands than others. Hormones also contribute to the thickness of hair, which is why some people experience sudden changes in hair thickness during puberty or pregnancy.

However, there are also other reasons why some hairs might be thicker than others. Poor diet, damaged hair, and hair conditions or disorders can all impact hair thickness. Additionally, brushing one part of your hair frequently or sleeping with your hair down can contribute to the problem.

Hair Anatomy

Hair is made up of a protein called keratin, which is produced in the hair follicle. The hair follicle is a tiny organ located in the skin that produces hair. Each hair follicle contains a hair shaft, which is the visible part of the hair that protrudes from the skin. The hair shaft is made up of three layers: the medulla, cortex, and cuticle. The medulla is the innermost layer of the hair shaft, followed by the cortex, and then the cuticle, which is the outermost layer of the hair shaft.

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The medulla is a soft, spongy layer that is not always present in hair. The cortex is the thickest layer of the hair shaft and contains the pigment that gives hair its color. The cuticle is a thin, protective layer that covers the cortex and helps to keep the hair shaft strong and flexible.

Hair growth occurs in three phases: anagen, catagen, and telogen. The anagen phase is the active growth phase, during which the hair follicle produces new hair. The catagen phase is a transitional phase, during which the hair follicle shrinks and the hair stops growing. The telogen phase is the resting phase, during which the hair follicle remains dormant and the old hair falls out.

The thickness of hair can vary depending on the diameter of the hair shaft. The thicker the hair shaft, the thicker the hair strand. Hair thickness can also be influenced by genetics, hormones, age, and certain medical conditions.

Genetics and Hormones

As someone who has wondered why some of my hairs are thicker than others, I have found that genetics and hormones are key factors that influence hair thickness. According to 23andMe, hair thickness is largely determined by genetics. Some people have wider hair follicles, which produce thicker hair strands than others. However, genetics is not the only factor that affects hair thickness.

Hormones also play a role in determining hair thickness. For example, androgens, which are male hormones that are also present in females, can stimulate hair growth and increase hair thickness. Women with polycystic ovary syndrome (PCOS), a hormonal disorder, often experience excessive hair growth due to high levels of androgens in their bodies. On the other hand, women who experience hormonal changes during menopause may notice a decrease in hair thickness.

It is important to note that although genetics and hormones are important factors in determining hair thickness, other factors such as age, diet, and hair care practices can also influence hair thickness. For example, as we age, our hair naturally becomes thinner and less dense. Additionally, a diet lacking in essential nutrients such as protein and vitamins can lead to hair thinning and loss. Lastly, using harsh hair care products or styling tools can damage hair follicles and lead to hair breakage and thinning.

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Environmental Factors

As I mentioned earlier, environmental factors can impact overall hair and scalp health. Exposure to sun and air pollution can cause damage to the hair, including protein loss, melanin oxidation, and surface damage. This damage can lead to thinner hair strands and an overall reduction in hair thickness.

In addition to external factors, internal factors such as diet and stress can also impact hair thickness. A poor diet lacking in essential nutrients can lead to weaker hair strands and hair loss. Stress can cause hair follicles to shrink, leading to thinner hair.

To combat the effects of environmental stressors, it is important to take care of your hair and scalp. Using hair care products that contain antioxidants and UV protection can help protect against sun damage. Regularly washing your hair can help remove pollutants and debris that can build up on the scalp and hair. Additionally, incorporating a healthy diet rich in essential vitamins and minerals can promote hair growth and thickness.

Hair Care Practices

As someone who has struggled with uneven hair thickness, I’ve learned that proper hair care practices can make a big difference in achieving a more uniform look. Here are some tips that have worked for me:

Brushing and Combing

Brushing and combing your hair regularly can help distribute natural oils throughout your hair, which can improve hair health and thickness. However, it’s important to be gentle and avoid brushing or combing too aggressively, as this can cause breakage and damage.

When brushing or combing your hair, start at the ends and work your way up to the roots. This can help prevent tangles and minimize breakage. Use a wide-toothed comb or a brush with soft bristles to avoid damaging your hair.

Heat Styling

Heat styling tools like flat irons and curling irons can cause damage to your hair, which can lead to uneven thickness. To minimize damage, use heat styling tools sparingly and always use a heat protectant spray.

When using a flat iron or curling iron, use the lowest heat setting possible that will still achieve the desired result. This can help minimize damage and keep your hair healthy and strong.

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Chemical Treatments

Chemical treatments like hair dye and perms can also cause damage to your hair, which can lead to uneven thickness. If you do decide to use chemical treatments, be sure to follow the instructions carefully and always use a deep conditioning treatment afterwards.

It’s also important to wait at least a few weeks between chemical treatments to give your hair time to recover. Overusing chemical treatments can cause long-term damage to your hair and lead to permanent uneven thickness.


After researching and analyzing various sources, I have come to the conclusion that there are several factors that can contribute to why some hairs are thicker than others. Genetics is a major factor, as some people are simply born with wider hair follicles that produce thicker hair strands. However, hormones, age, and damaging factors such as toxins, harsh winds, extreme cold & hot temperatures, chemicals, and dyes can also affect hair thickness.

Additionally, weak hair follicles, frequent brushing of one part of the hair, sleeping with hair down, and poor diet can also contribute to the problem. It is important to take care of our hair by avoiding harsh chemicals, protecting it from damaging factors, and maintaining a healthy diet.

It is also important to note that hair thickness can change over time due to various factors. For example, hormonal changes during pregnancy can cause hair to become thicker, while aging can cause hair to become thinner. Therefore, it is important to pay attention to changes in hair thickness and consult a healthcare professional if necessary.

In conclusion, while genetics plays a major role in hair thickness, there are several other factors that can affect it. By taking care of our hair and paying attention to changes in thickness, we can maintain healthy and beautiful hair.

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