HomeBlogHair LossAlopecia Areata: In-Depth Look at Hair Loss Causes and Treatment

Alopecia Areata: In-Depth Look at Hair Loss Causes and Treatment

Alopecia areata stands as a significant concern within the realm of dermatology, affecting countless individuals worldwide with its unpredictable hair loss. This autoimmune condition not only poses challenges in terms of physical appearance but also brings forth a considerable emotional toll on those it afflicts. Given its complexity and the myriad factors influencing its onset and progression, alopecia areata garners a high degree of interest from medical professionals and patients alike. Understanding its causes, symptoms, and the available treatments is fundamental not only for those directly impacted but also for the broader community seeking awareness and insight into this condition.

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What is Alopecia Areata?

Alopecia areata is an autoimmune disorder characterized by patchy hair loss on various parts of the body, most commonly on the scalp. The term “alopecia” refers to hair loss, while “areata” indicates that this loss occurs in small, random patches. This condition can manifest in several forms, depending on the extent and area of hair loss. Some individuals may experience total hair loss on the scalp, known as alopecia areata totalis, or complete hair loss across the entire body, termed alopecia areata universalis. Less common forms include diffuse alopecia areata, where hair thins rather than falls out in patches, and ophiasis alopecia areata, which involves a band of hair loss at the back and sides of the scalp.

The onset of alopecia areata can occur at any age and affects both genders equally across all racial and ethnic groups. It is often more pronounced and progressive in children under ten years old. While the exact cause of alopecia areata remains unclear, it is known to involve an attack by the immune system on the hair follicles, which are the structures in the skin responsible for hair production. This attack leads to the characteristic patchy hair loss associated with the condition.

Genetics also play a role in the susceptibility to alopecia areata. Individuals with a family history of the condition or other autoimmune disorders such as thyroid disease, diabetes, or lupus are at a higher risk. Environmental factors, including emotional stress or illness, might trigger alopecia areata in genetically predisposed individuals, although often no direct cause is identifiable.

Despite the challenges it poses, alopecia areata is relatively common, affecting nearly 7 million people in the United States alone. Among those affected, about 5% develop alopecia areata totalis, while 1% experience alopecia areata universalis. It is considered the second-most common form of hair loss, following pattern baldness.

Currently, there is no cure for alopecia areata, but various treatments can help manage the condition and potentially encourage hair regrowth. Support resources are also available to help individuals cope with the psychological effects of hair loss.

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Symptoms of Alopecia Areata

Hair Loss

Alopecia areata typically presents with the sudden onset of hair loss, forming round or oval patches that are smooth and bald, primarily affecting the scalp or beard area. However, this condition can manifest on any part of the body, including eyebrows, eyelashes, nostril hairs, and even leg hair. The affected areas often exhibit no signs of irritation such as swelling or discoloration, and the skin remains unscarred.

Individuals may notice short, broken hairs around the edges of the bald patches, often referred to as “exclamation point” hairs due to their narrow base and wider tip.
In some cases, the hair loss may progress, leading to more extensive bald patches or even complete hair loss on the scalp, known as alopecia totalis, or across the entire body, termed alopecia universalis.

The regrowth of hair is unpredictable; it may begin to reappear within a few months and could initially be white or gray before eventually returning to its natural color. However, new bald patches might develop even as previous ones begin to regrow hair.

Nail Changes

Nail abnormalities are another significant symptom of alopecia areata, occurring in approximately 10% to 66% of cases. These changes can precede or follow the hair loss and may persist even after hair regrowth. Common nail issues include pitting, ridging, brittleness, and in severe cases, dystrophic nails which may become painful.

The presence of nail changes is often associated with more severe forms of alopecia areata and can indicate a more challenging course of the disease. In individuals with extensive hair loss, such as those with alopecia universalis, nails may become rough, resembling sandpaper, or even crumble.

Understanding these symptoms is crucial for early detection and management of alopecia areata, providing a pathway to potential treatments and coping strategies for affected individuals.

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Causes of Alopecia Areata

Genetic Factors

Alopecia areata is significantly influenced by genetic factors which contribute to its development. The condition is classified as an autoimmune disease where the immune system erroneously targets hair follicles as foreign entities, leading to hair loss. This autoimmune response is often linked to specific genetic variations that affect immune system functions. Numerous genes, particularly those within the human leukocyte antigen (HLA) complex, are implicated in this inappropriate immune response. The HLA complex plays a crucial role in helping the immune system recognize the body’s own proteins from those of invaders.

Research has identified several genetic markers associated with alopecia areata. These include variations in genes that are also connected to other autoimmune disorders, suggesting a shared genetic foundation across these conditions. For instance, variations in the CTLA4 gene, which has been linked to multiple autoimmune diseases, have been found in individuals with alopecia areata. Additionally, genome-wide association studies (GWAS) have pinpointed specific regions in the genome, such as the IL2/IL21 locus and the HLA class II region, which are significantly associated with the disease.

Furthermore, studies have shown that alopecia areata can run in families, indicating a hereditary component. If alopecia areata is present in the family history, there is an increased risk of developing the condition, although not everyone who carries these genes will necessarily experience hair loss.

Environmental Triggers

While genetic predisposition plays a critical role in the onset of alopecia areata, environmental factors also contribute to triggering the disease. These triggers can include emotional stress, physical trauma, or illness, which may provoke an abnormal immune response in genetically susceptible individuals. However, it is essential to note that in many cases, no direct cause or trigger can be identified, making alopecia areata a particularly unpredictable condition.

The interaction between genetic makeup and environmental factors is complex. For some individuals, a combination of genetic predisposition and environmental exposure to a virus or other agents may initiate the autoimmune reaction that leads to hair follicle damage. This highlights the multifactorial nature of alopecia areata, where both inherited and external factors interplay to affect disease expression and progression.

Understanding these causes is vital for developing targeted treatments and managing the condition effectively, offering hope to those affected by this challenging disorder.

Types of Alopecia Areata

Patchy Alopecia Areata

Patchy alopecia areata is characterized by one or more coin-sized, usually round or oval, patches of hair loss on the scalp or other places on the body that grow hair. This form may progress to more severe types such as alopecia totalis or alopecia universalis but most commonly remains confined to small patches.

Alopecia Totalis

Alopecia totalis involves the total loss of hair across the entire scalp. This condition represents a more advanced stage of alopecia areata, where the immune system’s attack on hair follicles is extensive. Individuals with alopecia totalis may still exhibit exclamation point hairs around the areas of hair loss.

Alopecia Universalis

Alopecia universalis is the most severe form of alopecia areata, resulting in complete hair loss across the entire body, including the scalp, eyebrows, eyelashes, and all other body hair. This subtype affects a very small percentage of the population and involves a total shutdown of hair production by the immune system.

Diffuse Alopecia Areata

Diffuse alopecia areata causes a sudden, unexpected thinning of the hair all over the scalp, which can be difficult to distinguish from other forms of hair loss such as telogen effluvium or pattern hair loss. This type of alopecia areata may also affect other areas of the body in rare cases.

Ophiasis Alopecia Areata

Ophiasis alopecia areata refers to a pattern of hair loss where the balding occurs in a band along the sides and back of the head. It is one of the more distinctive patterns of alopecia areata, often affecting the temporal and occipital regions of the scalp.

Each type of alopecia areata presents unique challenges in diagnosis and management, reflecting the complex interplay between genetic predispositions and possible environmental triggers that influence the course of the disease.

Who Gets Alopecia Areata?

Genetic Predisposition

Alopecia areata can affect individuals with no family history of the disease; however, genetic factors play a significant role in predisposing individuals to this condition. Studies have identified several genes associated with alopecia areata, suggesting a strong genetic component. For example, the presence of specific genes within the human leukocyte antigen (HLA) complex has been linked to the disease, influencing how the immune system functions. Furthermore, having a close family member with alopecia areata increases one’s risk, although inheriting these genes does not guarantee the development of the condition. Genetic studies have also shown a high concordance rate in monozygotic twins, indicating the influence of genetic factors in alopecia areata.

Autoimmune Diseases

Individuals with certain autoimmune conditions are at a higher risk of developing alopecia areata. This includes those with diseases such as psoriasis, thyroid disease, and vitiligo, which are also autoimmune in nature. The link between alopecia areata and other autoimmune diseases is well-established, with common genetic markers often shared among these conditions. For instance, the CTLA4 gene, known for its role in autoimmune responses, has been associated with alopecia areata. Additionally, autoimmune thyroid diseases, such as Hashimoto’s disease and Graves’ disease, have been frequently observed in individuals with alopecia areata, further supporting the autoimmune hypothesis of this hair loss condition.

Stress and Illness

While genetic and autoimmune factors are significant, environmental triggers such as stress and illness also play a crucial role in the onset of alopecia areata. Emotional stress, physical injury, or illness may trigger an abnormal immune response in genetically susceptible individuals, leading to hair loss. Although it is often challenging to pinpoint a direct cause, many individuals report events of intense stress or illness preceding the onset of alopecia areata. These environmental factors, while not direct causes, are believed to contribute to the manifestation of the disease by influencing the immune system’s behavior.

Diagnosis and Tests

Physical Examination

Doctors and dermatologists initiate the diagnosis of alopecia areata with a thorough physical examination. They carefully inspect the areas of hair loss and the condition of the nails, as changes in nail texture can be indicative of alopecia areata. A dermatoscope, a specialized tool that magnifies the scalp and hair, is frequently used to get a clearer view of the hair follicles and any subtle signs of hair loss. During this examination, healthcare providers look for specific patterns of hair loss, check for redness, scarring, and any other abnormalities that might suggest different health conditions.

The pull test is another diagnostic tool where the doctor gently pulls on small sections of hair to determine if there is active hair loss. If more than six strands detach, this indicates ongoing hair loss. The tug test involves gently tugging hair to see if strands break easily, which helps assess hair strength and integrity. Additionally, a card test may be performed where a felt card is placed against the skin in a parted section of hair to identify very fine or broken strands that are otherwise hard to see.

Scalp Biopsy

If the physical examination results are inconclusive, a scalp biopsy might be necessary. This procedure involves removing a small piece of skin from the scalp to be examined under a microscope. A scalp biopsy helps in identifying the level and type of inflammation, the presence of scarring, and other microscopic features that confirm the diagnosis of alopecia areata or other types of hair loss conditions.

The biopsy is typically performed at the edge of a bald spot where there is some hair loss and possibly mild redness. It is advised to avoid areas with complete hair loss as they often provide limited diagnostic information. A 4 mm punch biopsy, aligned with the direction of hair growth, is recommended because it allows for standardized hair counts and a comprehensive assessment of the hair follicles and the scalp’s health.

Blood Tests

Blood tests play a crucial role in further diagnosing the cause of hair loss when alopecia areata is suspected. These tests do not directly confirm alopecia areata but are essential for ruling out other medical conditions that might cause similar hair loss patterns, such as thyroid disorders or nutritional deficiencies.

Common blood tests include checking levels of iron, ferritin, and vitamins to assess for deficiencies. A complete blood count (CBC) can rule out anemia, while thyroid function tests help detect any thyroid gland abnormalities. Additionally, levels of sex hormones are measured to exclude hormonal imbalances that could be contributing to hair loss.

By integrating these diagnostic approaches—physical examination, scalp biopsy, and blood tests—healthcare providers can accurately diagnose alopecia areata and differentiate it from other forms of hair loss, guiding appropriate management and treatment strategies.

Management and Treatment


Corticosteroids are a cornerstone in the management of alopecia areata due to their anti-inflammatory properties, which help reduce the immune system’s attack on hair follicles. Intralesional corticosteroid injections, particularly triamcinolone acetonide, are highly effective, with studies reporting hair regrowth in a significant percentage of patients. These injections are often considered the first-line treatment for localized alopecia areata. Topical corticosteroids are also widely used and can be applied in various forms such as creams, ointments, and foams. However, their effectiveness is generally lower in more severe forms like alopecia totalis and alopecia universalis.


Minoxidil is another key agent used to manage alopecia areata, known for its ability to stimulate hair growth. It is available in both 2% and 5% topical solutions and is used to enhance hair regrowth on the scalp, eyebrows, and beard area. Although the exact mechanism is not fully understood, it is believed to help by widening the hair follicle and prolonging the anagen phase of hair growth. Minoxidil is often used in conjunction with other treatments to maximize its efficacy.

Platelet-Rich Plasma (PRP) Injections

PRP injections have emerged as a promising treatment option for alopecia areata. This procedure involves injecting a concentration of a patient’s own platelets into the scalp to stimulate hair regrowth. Some studies have shown positive outcomes in hair density and stimulation of growth.


Phototherapy, including treatments like PUVA (psoralen plus ultraviolet A) and narrowband UVB, is utilized for its effectiveness in triggering hair regrowth in alopecia areata patients. The PUVA-turban method, where a dilute psoralen solution is applied to the scalp followed by exposure to UVA, has shown significant effectiveness in about 70% of treated patients.

Topical Immunotherapy

Topical immunotherapy is a treatment designed to provoke an allergic reaction that can alter the immune response at the site of hair loss, promoting hair regrowth. Common agents used include diphencyprone (DPCP) and squaric acid dibutyl ester (SADBE). This method can be particularly effective, with a notable percentage of patients experiencing significant hair regrowth. However, it may cause discomfort due to the induced allergic rash.

Each of these treatments offers a different mechanism of action to combat alopecia areata, and the choice of therapy is typically tailored to the individual’s specific condition and response to previous treatments.

Outlook and Prognosis

Possible Regrowth

Mild cases of alopecia areata often improve without intervention, with a high likelihood of hair regrowth within a year. Specifically, if less than half of the scalp is affected and no treatment is initiated, there is approximately an 80% chance of full hair regrowth within one year. However, the prognosis varies significantly with the extent of hair loss; more extensive hair loss reduces the likelihood of regrowth. Recurrences of the condition are common, and while complete hair regrowth is possible after an episode, further episodes may occur throughout an individual’s life. Progression to more severe forms such as alopecia totalis or alopecia universalis is more likely under certain conditions, such as onset in childhood, significant scalp involvement at the onset, or concurrent autoimmune conditions.

Impact on Quality of Life

Alopecia areata significantly impacts the quality of life, particularly in severe cases or those recently experiencing acute stress. Studies have quantified this impact using the Dermatology Life Quality Index (DLQI), where severe cases of alopecia areata show markedly higher DLQI scores, indicating greater impairment. The emotional toll is notable, with alopecia areata causing considerable anxiety and sadness, although support groups can provide crucial help. The quality of life can also vary with the type of alopecia, with universal forms generally leading to greater distress, particularly in women, due to societal emphasis on hair as a part of personal appearance.

This variability in quality of life underscores the importance of both medical and psychological support for individuals with alopecia areata, addressing not only the physical aspects of the disease but also its psychological impact.


Through our journey of understanding alopecia areata, we’ve explored the multifaceted nature of this autoimmune condition—from its causes and symptoms to the variety of treatments available. Striking a delicate balance between scientific insight and empathetic understanding, it’s clear that while there’s no definitive cure, there are multiple avenues for managing the condition and mitigating its impact on individuals’ lives. Our discussion underscores the critical importance of early diagnosis and personalized treatment plans, reinforcing the notion that, despite the challenges alopecia areata presents, there is substantial hope for those affected. The journey toward battling hair loss is both personal and profound, highlighting the resilience of the human spirit in face of adversity.

Navigating the complexities of alopecia areata requires a compassionate approach, acknowledging not only the physical but also the emotional toll it exacts on individuals. As we’ve delineated the types and treatments, we aim to empower you with knowledge, reassuring that assistance and support are within reach. For those seeking professional guidance, Get a Free Hair Analysis and Quote—our experts are here to assess your situation and craft a treatment plan tailored precisely to your needs. Remember, alopecia areata may be a part of your story, but it does not define you. With the right support, individuals can navigate this journey with confidence and hope, looking forward to a future where their condition is managed, and their well-being is preserved.


What triggers alopecia areata?
Alopecia areata is primarily caused by an autoimmune response where the immune system mistakenly targets the hair follicles, leading to inflammation. The exact reasons behind this immune system behavior are unclear, but it is thought to involve a combination of genetic and environmental factors.

Which autoimmune conditions are associated with alopecia areata?
Alopecia areata is often found alongside other autoimmune diseases. Some of these include vitiligo, lichen planus, morphea, lichen sclerosus et atrophicus, pemphigus foliaceus, atopic dermatitis, Hashimoto’s thyroiditis, hypothyroidism, endemic goiter, Addison’s disease, pernicious anemia, lupus erythematosus, and diabetes.

How can one prevent the immune system from attacking hair follicles in alopecia areata?
To mitigate hair loss from alopecia areata, treatment options may include contact immunotherapy, which aims to alter the immune system’s response to prevent it from attacking hair follicles. Additionally, JAK inhibitors can be used to suppress the overactive immune system, potentially allowing hair to regrow.What are effective strategies to halt the progression of alopecia areata?
Managing the progression of alopecia areata can involve several treatments. Oral systemic steroids are sometimes used. Minoxidil, commonly known as Rogaine®, can also be effective in stimulating hair growth on the scalp, beard area, and eyebrows and is usually applied two to three times a day. This treatment is particularly considered for older individuals.

Fahmida is an intern doctor in Bangladesh with eight high-impact publications in Q1 journals on emerging health issues and was awarded the “Inspiring Women Volunteer Award” in 2022 by the UN Bangladesh.

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