Hair Getting Thinner? 9 Possible Causes

Is your hair getting thinner, but aren’t sure what’s causing it? You’re not alone.

Due to the many potential causes of hair loss, many men and women aren’t sure how to treat the issue. They either hide the issue or accept it. But that doesn’t have to be the case for you.

We’ve compiled a list of 9 possible causes related to thinning hair and hair loss. Continue reading to find out what might be causing your hair issues.

1. Stress

There are many conditions caused or worsened by stress, including hair loss. This is especially true for women who are experiencing significant life changes or who recently experienced stressful physical or emotional events. 

This is a condition called Telogen Effluvium. Fortunately, it’s a temporary condition that will NOT result in complete baldness.

Women who experience this condition see excessive shedding of their hair a few months after a stressful life event. The process of hair loss begins around 2 or 3 months and then is at its worst around 5 or 6 months.

After this point, it should begin to resolve. 

On a positive note, there are products to help with women’s hair loss and thinning hair as a result of Telogen Effluvium. Ours come in tablets as well as shampoo. 

2. Nutrient Deficiency

A lack of proper nutrients can result in hair getting thinner or hair loss in some cases. They also result in other negative effects as well. Two of the most common thin hair or hair loss-related deficiencies relate to iron and vitamin B12.


Iron deficiency is the most common cause of women’s hair loss. This can be a result of a lack of iron in your diet, excessive exercise, and anemia. 

It’s also common for women to experience iron deficiency during pregnancy, resulting in thin hair at this time.

Vitamin B12

A lack of vitamin B12 in the body can cause hair loss alongside other unfortunate symptoms such as fatigue, difficulty with memory, and numbness. 

This can occur as a result of various medical conditions as well as diet (this is especially common for those following a vegan diet). If you are experiencing any of these symptoms, we recommend making an appointment with your doctor. 

3. Thyroid Issues

A large number of people, especially women, suffer from thyroid-related medical conditions including hyperthyroidism and hypothyroidism. Both of these conditions are among the top hair loss causes.


Hyperthyroidism occurs when your body produces an overabundance of the thyroxine hormone. 

The symptoms of hyperthyroidism include increased metabolism, irregular heartbeat, and thinning hair. There are treatments available for this condition. Talk with your doctor to find out more.


Hypothyroidism is the opposite of hyperthyroidism in that the body produces too little of the thyroxine hormone. 

This condition affects heart rate and the body’s temperature. Hair loss is another side effect of this condition and it’s most common in older women.

Medical treatments are available for this condition as well.

4. Rapid Weight Loss

Whether intentional or unintentional, rapid weight loss could be a cause of your thinning hair. This is related to the stress weight loss puts on your body. 

Even if weight loss is necessary to improve your health, the stress from the process may result in shedding. This is because it increases your hair growth cycle. 

5. Age

Hair loss and thinning hair are incredibly common among older men and women.

The first reason is the decrease in the amount of oil generation on the scalp. This leaves hair brittle, weak, and easily damaged. 

Another reason relates to cell regeneration. As we age, our cells begin to regenerate at a slower rate. This means the body is slower at replacing hair that sheds as part of normal body function. 

6. Diet

Diet plays an important role in producing healthy hair, If you are missing essential nutrients, vitamins, and minerals, your hair could pay the price.

Hair is made up of protein. A lack of protein in your diet can result in damaged hair as well as an inability to create new hair follicles. 

This becomes most noticeable after only 2 or 3 months of a protein-deficient diet. 

7. Infection

Keeping your hair healthy is not just about the hair itself, it’s also about your skin and scalp. 

Issues with the skin on your head can result from untreated dryness, skin sores, pests, or other conditions. For example, fungal infections are the most common cause of hairless for young children. 

This is why it’s important to regularly examine your scalp for any bumps, sores, or bugs. If you notice any of these conditions, talk with your doctor about treatment. 

8. Medication

Medications are meant to improve your health, but they can come with side effects such as thinning hair. This is not a side effect of all drugs, but there are many drugs known to cause hair loss. 

If you’ve recently started a new medication are noticing thinning hair or hair loss, talk with your doctor. 

9. Genetics

Does anyone in your family have issues with hair loss or thin hair? Unfortunately, this could be the cause of your own issues related to your hair getting thinner.

This can be passed down from either your mother or father, but you are more likely to experience hair loss if it affects both of your parents.

For women, this typically develops around the hairline and may develop as soon as your 20s. Your doctor can talk to you more about how to address issues related to genetic hair loss. 

Get to the Bottom of Your Hair Getting Thinner

Now that we’ve discussed the top 9 causes of hair loss, hopefully, you should have some understanding about your hair getting thinner.

Consider your diet, your genetics, your stress level, and any new changes to your life. If anything is out of the ordinary, or you’re experiencing additional symptoms, reach out to your doctor for treatment.

For more information on hair care and hair loss, visit our blog.

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