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Losing hair is a normal part of the hair growth cycle. Most people naturally shed between 50 and 100 hairs per day, and new hair replaces the old. But when hair loss is serious, it may indicate an underlying medical condition that requires professional attention.

This guide explains how to tell the difference between normal hair shedding and abnormal hair loss, the most common medical causes, and which doctor you should consult in Morocco.

Normal Hair Loss vs. Serious Hair Loss

What Is Considered Normal?

Hair shedding is usually not a cause for concern if you experience:

Losing 50 to 100 hairs per day
Slightly increased shedding during autumn (seasonal hair loss)
Temporary hair loss after childbirth (postpartum telogen effluvium)
Short-term shedding following severe stress or a high fever

When Hair Loss Is Serious

You should seek medical advice if:

You consistently lose more than 150–200 hairs per day
Bald patches appear on your scalp
Hair loss is accompanied by itching, redness, or scalp scaling
Your hair becomes noticeably thinner within less than three months
You lose hair from your eyebrows, eyelashes, or other parts of the body
Your hair part widens significantly over time

Medical Causes of Serious Hair Loss

1. Nutritional Deficiencies

Low levels of iron, ferritin, zinc, vitamin D, or protein can lead to diffuse hair loss. Iron deficiency anemia is one of the most common causes, particularly in women, and is often overlooked.

2. Thyroid Disorders

Both hypothyroidism and hyperthyroidism can disrupt the normal hair growth cycle. Since the thyroid regulates many body functions, thyroid testing is often one of the first investigations recommended for unexplained hair loss.

3. Chronic Stress

Long-term stress may trigger telogen effluvium, a condition in which a large number of hair follicles enter the shedding phase prematurely. Hair loss typically becomes noticeable two to three months after the stressful event.

4. Autoimmune Diseases

Alopecia areata is an autoimmune disorder that causes round patches of hair loss. In severe cases, it can progress to complete scalp hair loss (alopecia totalis).

5. Hormonal Imbalances

Hormonal changes are another common reason when hair loss is serious.

In women, possible causes include:

Polycystic ovary syndrome (PCOS)
Menopause
Changes in hormonal contraception

In men, androgenetic alopecia (male pattern baldness) linked to the hormone DHT is the leading cause of progressive hair loss.

6. Medication Side Effects

Certain medications may cause hair loss, including:

Chemotherapy drugs
Blood thinners (anticoagulants)
Some antidepressants
Acne medications
Blood pressure treatments

Which Doctor Should You See for Hair Loss?

The first step is to consult a general practitioner, who may recommend blood tests such as:

Iron and ferritin
Zinc
Thyroid function (TSH)
Hormonal evaluation

Depending on the results, you may be referred to:

A dermatologist for scalp and hair disorders
An endocrinologist if thyroid or hormonal conditions are suspected
A gynecologist for hormone-related hair loss in women
A general practitioner for the initial assessment and coordination of care

When Should You Seek Urgent Medical Care?

Seek prompt medical attention if your hair loss:

Starts suddenly and is very severe
Comes out in large handfuls
Is accompanied by fever, pain, or other unexplained symptoms

These signs could indicate a serious illness or an adverse reaction to medication that requires immediate evaluation.

Conclusion

Knowing when hair loss is serious can help you receive treatment before the condition worsens. While some hair shedding is completely normal, persistent, excessive, or unusual hair loss should never be ignored.

Early diagnosis can identify nutritional deficiencies, hormonal disorders, thyroid disease, autoimmune conditions, or other underlying health problems. If you notice persistent hair loss or additional symptoms, consult a healthcare professional as soon as possible to receive an accurate diagnosis and appropriate treatment.