Unexplained hair loss:

The reason behind the hair fall is most often diagnosed through the examination of scalp, blood test, past medication history, past illness history and serum nutrients level. However, there are some incidences where none of these factors, explained the reason for hair fall which is know as unexplained hair loss.

Unexplained hair loss accompanied by the palpitation and brain fog, often signs toward a significant nutrient deficiency that is often missed by the doctors. Not because of the negligence rather due to  the variation in the cut-off limits of the indicator of that nutrient level.

It’s not biotin, vitamin D, zinc or any hormone like thyroid hormone rather its iron deficiency which is ignored due to misinterpretation of ferritin level. Most people questions that what’s wrong with ferritin interpretation. It is included among baseline tests for diagnosing hair loss. How is it going to be misinterpreted?

The answer is yes; it has always been included in baseline tests for diagnosing the real reason behind the hair loss but it is often misinterpreted this is because that the normal range of ferritin is quoted as 15–200 ng/ml. The 15 ng/mL ferritin cutoff level comes from hematology, not dermatology.

Hair follicles are iron-sensitive tissues

Hair follicles are:

• rapidly dividing
• metabolically active
• non-essential for survival

The body will divert iron away from hair long before hemoglobin drops.

So, hair loss can occur:

• well above the anemia threshold
• while CBC looks “normal”

Think of iron like electricity in a house

• Lights (hair, cognition) turn off first
  Fridge (heart, blood) stays powered until much later

What’s the cut-off limit of ferritin in dermatology?

As per dermatological studies, the hair growth is usually compromised at or just below 30–40 ng/ml, causing diffuse hair thinning, increase shedding and reduction in the hair diameter. Hair growth has been shown to improve when the ferritin level was maintained above 40ng/ml. So, dermatologists often aim for Ferritin ≥40–70 ng/mL for hair regrowth, not because it’s “normal”, rather it’s functional for hair.

Why hair loss can happen at 30–40 ng/mL?

Hair loss can happen at or just below 30-40ng/ml because iron supply at this level is enough just for erythropoiesis. But is not enough for:

• Hair matrix cells
• Dopamine synthesis
• Mitochondrial enzymes and proper functioning of mitochondria. Improper functioning of mitochondrial makes the brain and cardiac cells energy deficient.

This explains why people get:

• hair shedding
• brain fog
• palpitations
• fatigue
  before the occurrence of iron deficiency anemia

Typical scenario for understanding:

• Lab range: 15–150 ng/mL
• Patient ferritin: 18–35 ng/mL
• Report says: Normal
• Symptoms persist: hair loss, brain fog

That is exactly the “missed pattern” being implied.