7 Medical Causes You Shouldn’t Ignore

Published by Pure Health Primary Care on April 5, 2026

Noticing More Hair Than Usual?

Hair shedding can be alarming.

You may notice:

• More hair in the shower or on your brush
• Thinning at the front or crown
• A widening part
• Hair that feels less full than before

Some daily hair shedding is normal.

But when hair loss becomes sudden, persistent, or visibly noticeable, it may point to an underlying issue that deserves attention.

What Is Considered Normal Hair Loss?

It is normal to shed approximately 50 to 100 hairs per day.

Hair loss becomes more concerning when you notice increased shedding over time, visible thinning, patchy loss, or poor regrowth.

7 Common Medical Causes of Hair Loss

1. Iron Deficiency

Low iron is one of the most common medical causes of hair shedding, especially in women. Even when anemia is mild or not yet present, low iron stores may still affect the hair growth cycle.

2. Thyroid Disorders

Both an underactive and overactive thyroid can contribute to diffuse hair thinning. Patients may also notice fatigue, weight changes, dry skin, or temperature intolerance.

3. Stress-Related Hair Shedding

Physical illness, emotional stress, surgery, rapid weight loss, or childbirth can trigger a type of shedding called telogen effluvium. Hair loss often begins weeks to months after the trigger.

4. Hormonal Changes

Hormonal shifts can affect hair growth and shedding. This may occur in the postpartum period, during perimenopause, or with conditions that affect androgen balance.

5. Nutritional Deficiencies

In addition to iron deficiency, low levels of certain nutrients may contribute to hair thinning, including:

• Vitamin B12
• Vitamin D
• Protein deficiency
• Zinc deficiency in select cases

6. Pattern Hair Loss

Gradual thinning at the crown or widening of the part may suggest pattern hair loss. This is common and may be influenced by genetics and hormones.

7. Medical Conditions or Medications

Hair loss may also be associated with autoimmune conditions, scalp disorders, chronic illness, or certain medications. Patchy hair loss or scarring changes should be assessed promptly.

Why Proper Assessment Matters

Hair loss is often dismissed as cosmetic.

However, in many cases, it is a symptom — not the root problem.

Identifying the cause early can help guide treatment, prevent progression, and address other symptoms that may be related.

When to Seek Medical Care

It is a good idea to book an assessment if:

• Hair loss is sudden or worsening
• You notice patchy or uneven loss
• You have scalp pain, redness, or scarring
• You also have fatigue, weight changes, or menstrual irregularities
• Hair is not regrowing

How Pure Health Primary Care Can Help

At Pure Health Primary Care, we provide evidence-based assessment and individualized care for hair loss concerns.

• Detailed history and symptom review
• Targeted blood work when appropriate
• Evaluation for common underlying causes
• Treatment recommendations based on diagnosis

Hair loss can be distressing — but in many cases, the cause can be identified and managed.

Take the Next Step Toward Better Health

If you are noticing unusual hair loss or thinning, an early assessment can help identify the cause and guide the right treatment.

Phone: 613-908-8999

Email: info@pureclinic.ca

Website: pureclinic.ca

This article was reviewed by Agnes Etaka, Nurse Practitioner at Pure Health Primary Care.

This article is for educational purposes only and does not replace medical advice or an individual clinical assessment.