Causes Of Hair Loss

March 1, 2024
Zak Ibrahimi
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What Causes Hair Loss: Unpacking the Underlying Reasons

Hair loss is a common concern that affects both men and women, often leading to emotional distress. Various factors can trigger hair thinning and loss. Understanding these causes is essential in identifying the appropriate treatment or management strategy. The scientific term for hair loss is alopecia, and it can manifest in different forms ranging from mild thinning to complete baldness.

Genetic predisposition is one of the primary causes of hair loss, particularly in cases of male or female pattern baldness. Hormonal changes and imbalances can also contribute to this condition, with issues such as thyroid problems, pregnancy, and menopause being notable triggers. Moreover, medical treatments like chemotherapy can lead to significant hair loss, although this is typically temporary.

External factors are equally influential in causing hair loss. These include physical stress from hairstyles that pull on the hair, poor nutrition lacking in essential vitamins and minerals, and psychological stress which can disrupt the hair growth cycle. Finally, scalp infections and autoimmune diseases can result in hair loss, necessitating medical intervention to address the underlying health issues. Understanding these various factors is crucial for individuals experiencing hair loss to seek the most effective solutions.

Common Causes of Hair Loss

Hormonal Changes and Medical Conditions

Hormonal fluctuations can significantly impact hair growth. Conditions such as pregnancy, menopause, and thyroid disorders may trigger hair loss. Alopecia areata, a type of hair loss resulting from an autoimmune response, and lupus or diabetes are medical conditions that can also lead to loss of hair.

  • Pregnancy: Hormonal changes during pregnancy can lead to temporary hair thinning.
  • Menopause: Post-menopausal women may experience hair loss due to a drop in estrogen levels.
  • Thyroid Disorders: Both hyperthyroidism and hypothyroidism can cause hair to fall out.
  • Alopecia Areata: A condition where the immune system attacks hair follicles, resulting in patchy hair loss.
hair loss from chemo

Medications and Treatments

Certain medications and medical treatments have side effects that include hair loss. Chemotherapy and radiation therapy for cancer are the most well-known causes, but other medications can also cause hair to thin or fall out.


  • Induces widespread hair loss by attacking rapidly dividing cells, including those responsible for hair growth.

Radiation Therapy:

  • Leads to hair loss in the specific body area treated.


  • Drugs for arthritis, depression, heart problems, and high blood pressure can cause hair loss.

Nutritional Deficiencies

Adequate nutrition is essential for healthy hair growth. Deficiencies in key vitamins and minerals can lead to hair thinning or loss.

  • Iron Deficiency: Lack of iron, often due to poor diet or heavy menstrual periods, can disrupt the hair growth cycle.
  • Vitamins: Insufficient intake of vitamins, especially B vitamins, can affect hair health.

Genetic Factors

Genetic predisposition plays a significant role in hair loss. Hereditary conditions like male pattern baldness and female pattern baldness are common and are attributed to one’s genes.

  • Male Pattern Baldness: Affects men and is characterised by a receding hairline and baldness on the top of the head.
  • Female Pattern Baldness: Women may experience overall thinning, particularly at the crown of the head.

Causes of Hair Loss Men Vs Women

Hair loss affects both men and women, albeit often due to different causes.

For men, the most common cause is androgenetic alopecia, or male pattern baldness. It is largely genetic and involves the hormone dihydrotestosterone (DHT), which causes hair follicles to shrink. Other contributors for men include:

  • Medical conditions: Diabetes, lupus, and thyroid disorders
  • Medications: Blood thinners, beta-blockers, and anabolic steroids
  • Lifestyle factors: Poor nutrition, smoking, and stress

In women, female pattern hair loss is prevalent, which tends to be more diffuse across the scalp. Women’s hair loss is often related to hormonal changes. Key factors include:

  • Hormonal shifts: Pregnancy, menopause, and polycystic ovary syndrome (PCOS)
  • Medical treatments: Chemotherapy and radiation therapy
  • Stressful events: Emotional stress and physical trauma

Additionally, certain hairstyles and treatments that apply tension or heat to the hair, like tight braids or straightening, can contribute to hair loss in women – a condition called traction alopecia.

Men’s Hair Loss (Most Common)Women’s Hair Loss (Most Common)
Genetic factors (DHT)Hormonal changes (pregnancy, PCOS)
Medications (steroids)Medical treatments (chemotherapy)
Lifestyle factors (smoking)Hairstyling practices (tight braids)

Nutritional deficiencies such as lack of iron, protein, or vitamins can affect both sexes, leading to thinning hair or hair shedding. Stress is another common denominator that can cause temporary hair loss in both men and women, medically known as telogen effluvium.

Types and Stages of Hair Loss

Understanding hair loss requires a grasp of the various types and stages. This section will examine the differences between temporary and permanent hair loss, the common patterns of hair loss, and the role of scarring in some types of alopecia.

Temporary vs Permanent Hair Loss

Temporary hair loss can occur due to numerous factors, including stress, nutritional deficiencies, and certain medical conditions. In this type, hair follicles remain viable, just dormant, and hair can regrow over time. Telogen effluvium is a classic example where hair prematurely enters the telogen (resting) phase. Conversely, permanent hair loss results from the destruction of hair follicles, making regrowth impossible without intervention.

  1. Temporary Hair Loss:
    • Telogen Effluvium: Triggered by shock or trauma; hair may return to the anagen (growth) phase over time.
    • Anagen Effluvium: Chemotherapy-induced hair loss, affecting follicles in the anagen phase.
  2. Permanent Hair Loss:
    • Androgenetic Alopecia: Affects men and women differently, leading to male pattern hair loss or female pattern hair loss.
    • Scarring Alopecias: Includes various types, all characterised by irreversible damage to hair follicles.

Pattern Hair Loss

Pattern hair loss, or androgenetic alopecia, is the most prevalent form of hair loss, influenced by genetics and androgens. It manifests distinctly in males and females.

  • Male Pattern Hair Loss: Often begins with a receding hairline, followed by thinning on the crown. Hair follicles shrink and eventually stop producing hair.
  • Female Pattern Hair Loss: Characterised by a general thinning over the scalp, especially at the crown, while the hairline remains.

Stages are typically assessed using the Norwood or Ludwig scales for men and women respectively, evaluating the progression of hair loss.

Scarring Alopecias

Scarring alopecias, also known as cicatricial alopecias, are a group of rare disorders resulting in permanent hair loss where inflammation destroys hair follicles and replaces them with scar tissue.

  • Central Centrifugal Cicatricial Alopecia (CCCA): Affects the scalp’s central part and spreads outward.
  • Frontal Fibrosing Alopecia: Hair loss typically near the forehead and eyebrows.
  • Scarring Alopecia (General): Irreversible and accompanied by symptoms like redness, scaling or pain.

Early intervention is crucial in managing these conditions to prevent further follicle damage.

Lifestyle Factors and Hair Care

Lifestyle choices and hair care practices have significant impacts on the condition of one’s hair. This section will explore how physical stress and certain hairstyles can contribute to hair thinning, the effects of chemical treatments, and the role environmental factors play in the health of your hair.

Physical Stress and Hairstyles

Physical stress on the scalp from tight hairstyles can lead to a condition known as traction alopecia, where hair is pulled out of the scalp over time. This thinning typically occurs around the hairline and can be exacerbated by styles such as tight braids, ponytails, and weaves. To mitigate this risk, one should consider looser hairstyles that do not put excessive strain on the hair follicles.

Chemical Exposure and Hair Treatments

The use of harsh chemicals in hair treatments, such as bleach and certain styling products, can cause damage to the hair and scalp, leading to hair thinning. Frequent chemical treatments may strip the hair of its natural protective oils, making it more susceptible to breakage. It is advisable to limit the use of treatments that include damaging substances and to choose products that are designed for your specific hair type.

Environmental Influences

Hair can also be affected by environmental factors, including exposure to the sun, which can weaken the hair over time. Wearing a hat can protect the scalp from UV rays, reducing the risk of damage. Additionally, smoking has been linked to poor hair health, as it impairs blood flow to the hair follicles, potentially leading to thinning hair. Prioritizing a healthy environment both inside and outside the body is crucial for maintaining hair vitality.

Diagnosis and Treatment Options

Identifying the cause of hair loss is crucial before considering treatment options. A medical professional can prescribe an effective treatment plan tailored to the individual’s condition.

Professional Diagnosis

A doctor or dermatologist is essential in diagnosing the cause of hair loss, which can range from nutritional deficiencies to autoimmune diseases. They may conduct blood tests to exclude certain medical conditions, and examine your scalp to assess the pattern and extent of hair loss. Accurate diagnosis influences the choice of treatment options.

Medicinal Treatments

Medications can often manage hair loss effectively, especially when initiated promptly. Minoxidil, applied topically, and finasteride, consumed orally, are commonly prescribed to men and can prevent further hair thinning and even stimulate regrowth. For women, spironolactone can serve as a treatment for certain types of hair loss. These medical treatments are not permanent solutions and require ongoing use.

Some of those most effective medical treatments include PRP for hair loss and PRF for hair loss. PRP, or Platelet-Rich Plasma therapy, involves drawing a patient’s blood, processing it to concentrate the platelets, and then injecting it into the scalp to stimulate hair growth. This method leverages the body’s natural healing processes and growth factors to promote hair regeneration.

Surgical and Non-Surgical Treatments

In cases where medicinal treatments are insufficient, hair transplant surgery may be an option. This procedure involves transplanting hair follicles from one part of the scalp to another. Alternatively, non-surgical treatments like laser therapy can stimulate follicles and encourage hair growth. Injections, such as corticosteroids, offer relief for hair loss due to autoimmune disease. For immediate but non-permanent solutions, wigs can provide aesthetic coverage for thinning areas or baldness.

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