What is alopecia and why does hair fall out?
Hair loss, or alopecia, is a common problem faced by millions of people around the world. This condition can significantly affect quality of life and self-esteem. Alopecia comes in many types, but it most often manifests as non-scarring hair loss, where hair follicles remain intact and hair growth can potentially resume. Alopecia areata (AA) is an immune-mediated disease characterized by the sudden appearance of one or more round or oval patches of hair loss, most often on the scalp, but it can also affect the beard, eyebrows, or other hairy parts of the body [3, 7].
The causes of hair loss can be multifactorial. In addition to genetic predisposition, they include endocrine disorders, side effects of certain medications, as well as physical or emotional stress [1]. In some cases, alopecia may be the first sign of more serious systemic problems, especially autoimmune diseases.
Autoimmune diseases and hair loss: a close connection
One of the most significant links in the pathogenesis of alopecia is its association with autoimmune diseases. Alopecia areata (AA) often accompanies other autoimmune conditions, such as thyroid disease, diabetes mellitus, and vitiligo [3]. A systematic review and meta-analysis of 17 studies involving more than 2,800 patients with AA showed that the prevalence of thyroid disease in people with alopecia areata is significantly higher compared to the control group, with an odds ratio of 3.66 [7]. These data underscore the importance of screening for thyroid disease in all patients diagnosed with alopecia areata [7].
Clinical cases confirm this relationship. For example, a 27-year-old woman with pre-existing autoimmune thyroid disease receiving hormone replacement therapy developed frontal alopecia. Laboratory tests revealed elevated prolactin levels, which may indicate a possible pathophysiological link between hyperprolactinemia and hair loss in the setting of autoimmune thyroiditis [1]. Another case describes a 28-year-old man whose beard alopecia areata became the first manifestation of incipient diabetes mellitus and developing thyroid disease [3]. These examples demonstrate that hair loss can be an important signal for identifying underlying autoimmune disorders.
Trichodynia: pain accompanying hair loss
In addition to aesthetic and psychological problems, hair loss can be accompanied by physical discomfort known as trichodynia. This condition is characterized by pain or burning in the scalp and can significantly impair the quality of life of patients with various hair growth disorders [2]. Traditional treatments for trichodynia are often ineffective, creating a need for new therapeutic approaches.
Recent studies have shown the promise of using intradermal botulinum toxin type A (BTX-A) for the treatment of trichodynia associated with hair loss. A retrospective study of 21 patients who did not respond to standard therapy demonstrated significant symptom improvement in the majority (90.5%) within an average of 18.3 days after BTX-A injections. Mean pain scores on the visual analog scale (VAS) decreased from 8.0 to 2.0 at 3 months and reached 0.0 by 6 months. Moreover, patients with scarring alopecia showed a significant reduction in disease activity scores according to the Lichen Planopilaris Activity Index (LPPAI). BTX-A treatment was well tolerated, with minimal side effects [2]. This method offers new hope for patients suffering from chronic scalp pain associated with alopecia.
Modern approaches to alopecia treatment
Treatment of alopecia requires a comprehensive approach, starting with thorough diagnostics and identification of possible comorbidities. Laboratory evaluation plays a key role in determining the root cause of hair loss, especially when autoimmune disorders are suspected [3].
Main treatment methods for alopecia areata include:
- Corticosteroid therapy: This is one of the most common and effective methods. Corticosteroids can be used topically (in the form of creams or lotions) or intralesionally (injections directly into the affected areas of the scalp or beard) [3]. For example, a topical 0.1% triamcinolone acetonide cream twice daily led to complete regrowth of beard hair in a patient with beard alopecia areata after six months [3].
- Immunotherapy: Includes various approaches aimed at modulating the immune response that underlies alopecia areata [3].
- Janus kinase inhibitors (JAK inhibitors): This is a relatively new class of drugs that show promising results in the treatment of severe forms of alopecia areata by blocking signaling pathways involved in autoimmune inflammation [3].
- Laser therapy and photodynamic therapy: Can be used as additional methods to stimulate hair growth [3].
- Platelet-rich plasma (PRP) therapy: Involves injecting the patient's own plasma, rich in growth factors, into the scalp to stimulate hair follicles [3].
- Treatment of concomitant infections: In some cases, for example, when an Helicobacter pylori infection is detected, its eradication may contribute to an improvement in hair condition [3].
- Botulinum toxin type A: As already mentioned, it is effective for relieving trichodynia associated with hair loss [2].
When to see a doctor?
If you notice signs of increased hair loss, the appearance of bald patches, or accompanying scalp pain, it is extremely important to consult a specialist in a timely manner. Family doctors are often the first to encounter this problem, but for accurate diagnosis and the selection of effective treatment, a consultation with a dermatologist is necessary, and in case of suspected systemic diseases, an endocrinologist or other specialized specialists. Early diagnosis and a comprehensive approach allow not only to restore hair growth but also to identify and correct possible hidden health problems.
Sources
- Alopecia in preexisting autoimmune thyroid disease in family medicine practice: can hyperprolactinemia induce hair loss? A case report.
- Effectiveness of Botulinum Toxin Type A for Trichodynia Associated with Hair Loss Disorders: A Retrospective Study.
- Incipient Diabetes Mellitus and Nascent Thyroid Disease Presenting as Beard Alopecia Areata: Case Report and Treatment Review of Alopecia Areata of the Beard.
- Increased Incidence of Thyroid Disease in Patients with Alopecia Areata: A Systematic Review and Meta-Analysis.
Disclaimer: The information provided in this article is for reference purposes only and is not intended for self-diagnosis or self-treatment. Always consult a qualified medical professional for an accurate diagnosis and an individualized treatment plan.