If you're finding more strands in your brush than usual, or your ponytail just doesn't feel like it used to, you're not alone. Hair thinning is really common, in women and men, and I know it can affect how you feel about yourself, not just how your hair looks. Before you assume the worst, though, it helps to ask: is your hair fine, or is it thinning?
Understanding what's causing it is the most important first step. Below I go through how hair grows, the most common causes of thinning, how it gets diagnosed, and the everyday habits that help.
Index
Understanding Hair Growth Cycle
It's easy to picture hair growing a little bit every day, nonstop. It actually works in cycles, and knowing how they work helps explain why hair thins.
The Hair Growth Cycle
There are three phases: anagen (growth), catagen (transition) and telogen (rest).
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Anagen Phase
This is when your hair actively grows. It can last anywhere from two to seven years, and how long it lasts decides how long your hair can get. -
Catagen Phase
A short transition of about two to three weeks. The follicle shrinks and detaches from the dermal papilla, the structure that feeds the hair. -
Telogen Phase
The resting phase, which lasts about three months. The hair stops growing but stays in place while a new hair forms underneath. Once the new hair is ready, it pushes the old one out, and the cycle starts again.
At any time, about 90% of your hair is growing and about 10% is resting. That's why losing 50 to 100 strands a day is completely normal. If you're losing a lot more than that, something may be throwing the cycle off.
Causes of Hair Thinning
Thinning hair is upsetting, and it's even more frustrating when you don't know why it's happening. These are the most common causes:
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Nutritional Deficiencies
Being low in nutrients like iron, zinc, vitamin D and B vitamins can contribute to thinning, sometimes through telogen effluvium, a type of increased shedding. -
Hormonal Changes
One of the leading causes in women. Pregnancy, menopause and conditions like PCOS can all cause hair to thin. -
Androgenetic Alopecia
A common genetic condition in women and men, also known as male-pattern and female-pattern hair loss. In women, it often shows up as thinning across the top of the scalp or a widening part. -
Stress and Emotional Trauma
High stress, physical or emotional, can disrupt the hair cycle and lead to telogen effluvium. It may also play a role in alopecia areata. -
Age
As we get older, hair naturally gets finer and follicles become less active. That's a normal part of aging. -
Heat and Chemical Styling
Too much heat, chemical treatments and tight styles can cause breakage, which makes hair look thinner. -
Scalp Conditions
Seborrheic dermatitis, psoriasis and fungal infections can disrupt your scalp and make hair look thinner. -
Autoimmune Conditions
Conditions like alopecia areata and lupus can cause thinning and hair loss when the immune system attacks the hair follicles. -
Medications and Medical Treatments
Some medications, including ones for cancer, arthritis, depression, heart disease and high blood pressure, can cause hair loss. -
Weight Loss and Crash Dieting
Rapid weight loss, especially from crash dieting or an eating disorder, can leave you low in the nutrients your body needs and lead to thinning. -
Thyroid Disorders
Both an underactive and an overactive thyroid can disrupt the hair cycle and cause thinning. -
Postpartum Hair Loss
Many women notice a lot of shedding after giving birth as estrogen levels drop. It's usually temporary. -
Environmental Factors
Sun, pollution and hard water can damage hair over time and lead to breakage. -
Smoking
Smoking reduces circulation and has been linked to hair loss.
Identifying and Diagnosing Thinning Hair
Finding the cause usually means looking at your lifestyle, diet, medical history and family history. A doctor or dermatologist might use any of these:
- Physical exam: a close look at your hair and scalp to spot scalp conditions, pattern hair loss or damage.
- Medical history: things like hormonal conditions, autoimmune disease, recent childbirth, stressful events and the medications you take.
- Diet review: since nutrient deficiencies are a common cause, they may ask about iron, zinc, and vitamins B and D.
- Pull test and hair count: simple tests that show how much you're shedding and how dense your hair is.
- Blood tests: to check for things like thyroid problems or low iron.
- Scalp biopsy: in more complicated cases, a tiny sample of scalp skin gives a close look at the hair roots.
Everyone's story is different, and it can take a little detective work. If you're noticing a lot of thinning, please see a healthcare professional or a dermatologist. They can run these tests and help you figure out what's really going on.
Can Thinning Hair Grow Back?
It depends on the cause. In many cases, once the underlying cause is identified and addressed with a professional, thinning can settle down.
- Nutritional deficiencies: If a deficiency is behind your thinning, a doctor can help you correct it through diet or the right supplement.
- Hormonal imbalances: Conditions like PCOS or thyroid problems can be managed with a healthcare professional, and as things rebalance, hair often improves.
- Physical or emotional stress: With stress-related shedding, hair usually goes back to its normal cycle once your body recovers.
- Medication side effects: If a medication is the cause, your doctor may be able to suggest an alternative.
- Androgenetic alopecia: It's genetic, but treatments like minoxidil (Rogaine) and finasteride (Propecia) can help slow hair loss and even regrow hair for some people. They have to be used consistently to keep working, and a doctor should guide you.
- Scalp conditions: Seborrheic dermatitis or psoriasis can be managed with the right treatment from a dermatologist.
What Can I Do About Thinning Hair?
There's no silver bullet for thinning hair, and I'd be wary of anyone who sells you one. But there are everyday habits that are good for your hair and your overall health.
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Eat well
Lean meats, fish, fruits, vegetables, whole grains and healthy fats give your body the vitamins and minerals it needs. -
Stay hydrated
Water matters for your overall health, and your hair is part of that. -
Move your body
Exercise is great for your overall health and circulation. Here's what I think about exercise and hair. -
Limit heat and chemical styling
Heat and harsh chemical treatments can cause a lot of breakage. Always use a heat protectant, and keep heat and chemicals to a minimum. -
Be gentle
Pulling and tugging when you brush or style can cause breakage. Go slow. -
Massage your scalp
A scalp massage is a relaxing way to care for your scalp. -
Manage stress
Ongoing stress can contribute to thinning. Yoga, meditation, deep breathing, or anything that helps you unwind. -
Avoid tight hairstyles
Tight ponytails, braids and buns pull on your follicles and can cause a type of hair loss called traction alopecia. Looser styles are kinder. -
Goldie Locks® Hair Supplements
Our customers love making Goldie Locks® Hair Supplements part of their daily routine. -
Scalp care with the derma roller
Our Micro-Needle Derma Roller is something nice to add to your scalp care routine. You can read more about how to use a derma roller here.
The Link Between Vitamin Deficiencies and Hair Thinning
A balanced diet is important for your overall health, hair included. When you look into which vitamin deficiencies are linked to hair loss, a few come up again and again:
- Vitamin D: Low vitamin D has been linked to hair loss.
- Vitamin A: Your body needs it for cell growth, but balance matters. Too little or too much vitamin A can both be linked to hair loss.
- B vitamins: A biotin (B7) deficiency can lead to thinning hair. B12 and B6 help your body make red blood cells.
- Vitamin E: An antioxidant your body uses every day. Learn more about vitamin E and hair.
- Iron: Not a vitamin, but an essential mineral, and low iron is one of the more common nutritional causes of shedding.
It can be hard to get all of these from your diet every day. That's why many of our customers add Goldie Locks® Hair Supplements to their daily routine. If you think you might be low in something, ask your doctor for a blood test first.
Common Questions and Concerns
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What is the main cause of hair thinning?
There isn't just one. It can come from genetics, hormones, stress, nutrient deficiencies or a medical condition. Finding the cause is the most important step. -
Can thinning hair grow back?
Often, yes, especially when it's caused by something temporary or treatable, like stress or a deficiency. Finding and addressing the cause is key. -
How can I stop my hair thinning?
It starts with understanding the cause. Once a professional has identified it, whether it's hormonal, stress, a nutrient deficiency or a medical condition, they can recommend the right next steps, from lifestyle changes to medication or topical treatments.
If you're dealing with significant thinning or hair loss, please talk to a healthcare provider. They can help you find the right path for you.
Final Thoughts
Hair thinning has a lot of possible causes, from genetics and hormones to stress, nutrition and health conditions. It can feel overwhelming, but it's not a life sentence. With the right information and the right professional support, there's a lot you can do.
Be gentle with your hair, take care of yourself, and get the cause checked out. And if you'd like a supplement as part of your routine, our customers love Goldie Locks® Hair Supplements.