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Alopecia – Causes, Symptoms and Treatment

Alopecia is the medical term for partial or complete hair loss on the scalp or body. Causes range from genetic factors to underlying medical conditions or medications.

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Things worth knowing about "Alopecia"

Alopecia is the medical term for partial or complete hair loss on the scalp or body. Causes range from genetic factors to underlying medical conditions or medications.

What is Alopecia?

Alopecia is the medical term for hair loss. It can involve partial hair loss (partial alopecia) or complete hair loss (total alopecia) and may affect the scalp as well as other hair-bearing areas of the body such as eyebrows, eyelashes, or the entire body surface. Alopecia can affect men, women, and children of all ages, and its course varies greatly depending on the underlying cause.

Types of Alopecia

There are several distinct types of alopecia, each differing in cause, appearance, and progression:

Androgenetic alopecia: The most common form, also known as male-pattern or female-pattern baldness. In men, it typically presents as a receding hairline and crown thinning; in women, as diffuse thinning at the top of the scalp.
Alopecia areata: An autoimmune condition in which the immune system attacks hair follicles, resulting in smooth, round patches of hair loss.
Diffuse alopecia: Uniform thinning across the entire scalp, often caused by nutritional deficiencies, stress, thyroid disorders, or medications.
Scarring alopecia: A rare form in which hair follicles are permanently destroyed, making regrowth impossible.
Alopecia totalis / universalis: Complete loss of all scalp hair (totalis) or all body hair (universalis).

Causes

The causes of alopecia are diverse and depend on the type of hair loss:

Genetic predisposition: Hereditary factors play a central role in androgenetic alopecia.
Autoimmune reactions: In alopecia areata, the immune system mistakenly targets hair follicles.
Hormonal changes: Pregnancy, menopause, or thyroid disorders can trigger hair loss.
Nutritional deficiencies: Low levels of iron, zinc, biotin, or protein can lead to diffuse hair loss.
Medications: Chemotherapy drugs, anticoagulants, and certain blood pressure medications are known to cause hair loss.
Stress and psychological strain: Significant emotional or physical stress can trigger temporary hair loss, known as telogen effluvium.
Infections and systemic diseases: Fungal infections of the scalp or conditions such as lupus erythematosus can also cause alopecia.

Symptoms

Symptoms vary depending on the type of alopecia:

Round, smooth bald patches on the scalp (alopecia areata)
Receding hairline or thinning at the crown (androgenetic alopecia)
Gradual, uniform thinning across the entire scalp (diffuse alopecia)
Increased hair shedding during washing or brushing
In rare cases, itching, burning, or tenderness of the scalp

Diagnosis

Alopecia is typically diagnosed by a dermatologist. The following diagnostic tools may be used:

Clinical examination: Assessment of the hair loss pattern and scalp condition.
Trichoscopy: Magnified examination of hair follicles using a dermatoscope.
Blood tests: To rule out nutritional deficiencies, hormonal imbalances, or autoimmune conditions.
Trichogram: Microscopic analysis of plucked hair roots to evaluate the phases of the hair growth cycle.
Scalp biopsy: A small tissue sample may be taken in unclear or complex cases.

Treatment

Treatment depends on the cause and type of alopecia. Not all forms require or respond to treatment:

Pharmacological Treatment

Minoxidil: A topically applied solution that improves scalp blood flow and stimulates hair regrowth. Approved for both men and women.
Finasteride: An oral medication for men that inhibits the conversion of testosterone to dihydrotestosterone (DHT), a key driver of androgenetic alopecia.
Corticosteroids: Anti-inflammatory corticosteroids applied topically or given systemically are commonly used for alopecia areata.
JAK inhibitors: A newer class of medications used in severe alopecia areata (e.g., baricitinib).

Additional Treatment Options

Hair transplantation: A surgical method for permanent hair restoration in cases of androgenetic alopecia.
Platelet-Rich Plasma (PRP): Injections of platelet-rich plasma into the scalp to stimulate hair follicles.
Treatment of underlying conditions: In secondary alopecia, addressing the root cause is the primary goal.
Nutritional supplementation: Targeted supplementation when specific deficiencies have been confirmed.

Psychosocial Impact

Hair loss can significantly affect self-image and quality of life. Many people experience feelings of shame, social withdrawal, or depression. Psychological support or participation in self-help groups may therefore be a valuable part of overall care.

References

German Dermatological Society (DDG): Guidelines for the Diagnosis and Treatment of Alopecia. AWMF Register No. 013-055 (2021).
Trüeb RM. Molecular mechanisms of androgenetic alopecia. Experimental Gerontology, 37(8-9): 981-990 (2002). PubMed PMID: 12213465.
Pratt CH, King LE Jr., Messenger AG, Christiano AM, Sundberg JP. Alopecia areata. Nature Reviews Disease Primers, 3: 17011 (2017). PubMed PMID: 28300084.

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