Your Global Health Resource

Hair loss is not always caused by androgenetic alopecia. There are multiple forms
of non-androgenetic baldness, many of which are reversible if treated appropriately. Recognizing them is essential to choosing the right treatment and improving the prognosis. After reading this article, you will see the importance of a good diagnosis.

Common causes of non-androgenetic baldness
1. Hypothyroidism and hyperthyroidism:
Thyroid disorders affect the hair follicle cycle. Both thyroid hormone deficiency and excess can cause diffuse hair loss, which is usually reversible with appropriate endocrinological treatment.
2. Vitamin B12 and iron deficiency:
These micronutrients are essential for hair growth. Their deficiency causes telogen effluvium (diffuse hair loss). It is common in people with anemia, strict vegetarians, patients with intestinal malabsorption, or those after bariatric surgery.
3. Physical or Emotional Stress:
Major stressful events (surgeries, infections, personal losses) can induce acute telogen effluvium, where much of the hair enters the shedding phase a few months after the event.
4. Bariatric Surgery:
Rapid weight loss and nutritional deficiencies following these procedures can trigger significant hair loss, which is usually reversible with supplementation and proper nutrition.
5. Medications:
Some medications can cause alopecia, such as:
Chemotherapy (anagen alopecia)
Anticoagulants
Antidepressants
Beta-blockers
Oral retinoids (e.g., isotretinoin)
Anticonvulsants
6. Dermatological Disorders:
Diseases such as seborrheic dermatitis, scalp psoriasis, cutaneous lupus, or fungal infections (ringworm) can also cause localized or diffuse hair loss.

7. Alopecia areata: 

Autoimmune disease where the immune system attacks the follicles, causing
round patches of baldness. It can be self-limiting or chronic. It is not androgenetic.

Diagnosis
Diagnosis should begin with a detailed medical history, examining:
Chronology of hair loss
Triggering factors (stress, surgery, medications)
Comorbidities (thyroid, anemia, autoimmune diseases)
Physical examination (hair loss pattern, inflammation, scaling)
Additional tests:
TSH, T3, and T4 for thyroid function
Cell count, ferritin, B12, folic acid
Scalp biopsy in difficult cases
Trichogram or in-office dermatoscopy

Treatment
Treatment depends on the underlying cause:
Thyroid: normalize levels with levothyroxine or antithyroid drugs
Nutritional deficiencies: correct with supplementation (B12, iron, zinc, protein)
Stress: psychological management, mindfulness, pharmacotherapy if necessary
Discontinue implicated medications when possible
Diseases Dermatological: topical or systemic treatment depending on the case
Alopecia areata: topical or intralesional corticosteroids, immunotherapy, JAK
inhibitors (in advanced cases)
In many cases, direct hair treatment is not required, since correcting the cause
stops hair loss and hair regrows naturally.

Prognosis
The prognosis varies:
Telogen effluvium due to stress, surgery, or nutritional deficiency is usually reversible in 3 to 6 months. Endocrine causes have a good prognosis if controlled. Alopecia areata can be unpredictable: in some cases, there is complete remission, in others, recurrence or progression. Scarring or infectious alopecia requires prompt treatment to prevent irreversible damage.

Conclusion
Non-androgenetic baldness is common, multifactorial, and frequently reversible.
A proper diagnosis and treatment of the underlying cause are key to successful
hair restoration. If you have any questions, consult with a specialist in internal
medicine, dermatology, or endocrinology 

Raul Ayala, MD
@MyDoctorOnCall.com