Telogen Effluvium Causes: Why Sudden Hair Shedding Happens

Noticing more hair on your pillow, in the shower drain, or on your comb is unsettling - especially when it seems to happen without warning. Telogen effluvium is a temporary but significant form of hair shedding triggered when the body experiences stress, a nutritional shift, or a hormonal change, pushing large numbers of hair follicles into a resting phase at once.

Key takeaways:

• Telogen effluvium is not the same as genetic hair loss - it is largely reversible

• It often appears 2–3 months after a triggering event, not immediately

• Multiple triggers can stack, making shedding more severe

• UAE-specific factors like heat, hard water, and dietary gaps can extend the shedding period

• Identifying and addressing the root cause is more effective than treating shedding alone

What Is Telogen Effluvium

Hair grows in cycles. At any given time, most follicles are actively growing (the anagen phase), a small number are transitioning (catagen), and roughly 10–15% are resting (telogen). After the resting phase, old hairs shed and new growth begins.

Telogen effluvium happens when a physical or emotional disruption signals the body to push a much larger percentage of follicles - sometimes up to 30–50% - into the telogen phase simultaneously. When these follicles complete their rest cycle weeks or months later, the hair sheds all at once, leading to noticeable and often alarming thinning across the scalp.

It tends to be diffuse, meaning it spreads evenly rather than creating bald patches. The scalp itself is generally not inflamed or scaly, which helps distinguish it from other causes of hair loss. The condition can affect men and women, though it presents differently based on hair density, hormonal profiles, and lifestyle patterns.

Why There Is a Delay Between the Trigger and the Shedding

One of the most confusing aspects of telogen effluvium is timing. Most people cannot connect the shedding they see today to something that happened months ago. This delay exists because hair follicles do not shed instantly when they enter the telogen phase. They rest for approximately 2–3 months before the hair physically falls out.

This means someone who experienced a significant illness in March may only begin noticing heavy shedding in May or June. By that point, the original trigger has often resolved, making the cause easy to miss. Understanding this delay is critical for accurately identifying what caused the shedding.

Telogen Effluvium Causes: The Core Triggers

Several well-documented triggers can push hair follicles into premature rest. In most cases, the shedding is the body's response to a perceived internal emergency - it deprioritises non-essential functions like hair growth to redirect energy elsewhere.

Physical Stress and Illness

High fever, surgery, severe infections, or any serious illness places significant metabolic pressure on the body. COVID-19 became one of the most widely reported triggers globally, with post-illness shedding affecting a large number of people. The body essentially pauses hair growth temporarily to focus on recovery.

In the UAE, seasonal illnesses compounded by extreme temperature shifts - moving constantly between outdoor heat and heavily air-conditioned interiors - place chronic low-grade physical stress on the body, which can subtly disrupt hair cycles over time.

Hormonal Changes

Hormonal fluctuations are among the most common causes in women. Postpartum hair loss is a well-recognised form of telogen effluvium. During pregnancy, elevated oestrogen levels keep more follicles in the growth phase than usual, giving hair a fuller appearance. After delivery, hormone levels drop rapidly, and all those follicles enter telogen together - resulting in significant shedding 2–4 months postpartum.

Thyroid dysfunction - both hypothyroidism and hyperthyroidism - also disrupts the hair cycle. Thyroid conditions are not uncommon among women in the UAE, and because fatigue, mood changes, and weight fluctuations dominate the clinical picture, hair loss is sometimes overlooked as a symptom until shedding becomes severe.

Discontinuing hormonal contraceptives can also trigger a temporary shedding episode as the body readjusts to its natural hormonal rhythm.

Nutritional Deficiencies

Hair follicles are among the most metabolically active structures in the body. They require a continuous and adequate supply of micronutrients to sustain growth. When key nutrients are insufficient, follicles shut down early.

The most commonly implicated deficiencies in telogen effluvium include:

• Iron deficiency (even without overt anaemia, low ferritin levels affect follicle activity)

• Vitamin D deficiency, which is widespread in the UAE despite high sun exposure due to indoor lifestyles, sunscreen use, and darker skin tones requiring longer sun exposure for synthesis

• Zinc

• Vitamin B12, particularly in individuals following vegetarian or vegan diets

• Protein - diets built heavily around refined carbohydrates and low animal or plant protein intake reduce the amino acids needed for keratin production

Crash dieting or sudden caloric restriction is a particularly well-known trigger. The body rapidly reduces energy allocation to non-vital processes, and hair growth stops almost immediately after severe caloric deficit begins.

Emotional and Psychological Stress

Chronic stress elevates cortisol levels in the body. Sustained high cortisol affects the hormonal signals that regulate the hair growth cycle, nudging follicles towards premature telogen entry. This is not the temporary stress of a difficult day - it is the sustained, unresolved pressure of job insecurity, relationship strain, financial anxiety, or prolonged burnout.

In the UAE, demanding work schedules, long commutes, shift work, and the pressure of living far from family support systems create a chronic stress environment that many residents navigate daily. Sleep disruption - common among those working late shifts or irregular hours - further compounds this by interfering with the nocturnal repair processes that support cellular functions, including those of hair follicles.

Rapid Weight Loss and Restrictive Dieting

Extreme caloric restriction - whether from fad diets, intermittent fasting taken to an unhealthy extreme, or disordered eating - deprives hair follicles of the fuel they need. When caloric intake drops sharply, the body prioritises vital organs and downregulates hair growth almost immediately. The shedding that follows 2–3 months later can be significant and distressing, particularly because the person may feel they were doing something positive for their health.

Medications

Certain medications are known to push hair follicles into telogen prematurely. These include some blood pressure medications, anticoagulants, antidepressants, retinoids, and cholesterol-lowering drugs. Stopping a medication without guidance, or starting a new one, can both serve as triggers. Anyone noticing hair changes after a medication change should bring this to a doctor's attention.

Scalp and Environmental Factors in the UAE

While the root cause of telogen effluvium is almost always internal, the UAE environment adds external pressures that can extend the shedding phase or delay recovery. Hard desalinated water - standard across much of the UAE - contains higher levels of calcium and magnesium. These minerals deposit on the scalp and hair shaft, altering the scalp's surface environment and potentially worsening dryness or barrier disruption over time.

Constant exposure to air conditioning strips moisture from both the hair shaft and the scalp surface. Stepping from 45-degree outdoor heat into heavily cooled indoor spaces repeatedly throughout the day is a pattern unique to Gulf living, and while it may seem trivial, the scalp responds to these environmental fluctuations. A compromised scalp barrier does not cause telogen effluvium directly, but it can make recovery slower and the visible impact more pronounced.

Telogen Effluvium Triggers Compared

How Telogen Effluvium Differs in Men and Women

Both men and women experience telogen effluvium, but the pattern and experience can differ meaningfully.

In women, shedding tends to be more visually alarming because women typically have longer hair, making volume loss and increased shedding on the brush or drain easier to notice. Women are also more vulnerable to postpartum triggers, thyroid-related episodes, and the effects of iron deficiency due to menstrual blood loss.

In men, shedding may be masked or confused with early-stage androgenetic alopecia (pattern baldness), delaying accurate identification. Men are equally affected by stress, illness, and nutritional gaps as triggers, but these causes can be overlooked when hair thinning is assumed to be genetic by default.

Habits That Worsen the Shedding Period

Certain behaviours do not cause telogen effluvium but can worsen the experience during an active shedding episode or slow recovery.

Tight hairstyles - ponytails, buns, or braids worn constantly - add traction stress to already weakened follicles. Aggressive combing or brushing on wet hair increases mechanical breakage, which adds to visible hair loss on top of natural shedding.

Heat styling tools used without protection accelerate cuticle damage, making existing hair more fragile during a period when the scalp is already trying to recover. Skipping meals, continuing restrictive eating, or maintaining high-stress routines without any recovery practice all extend the period of follicle disruption.

Poor sleep is particularly relevant in the UAE context. The body performs significant cellular repair during deep sleep, including processes that support follicle health. Chronic sleep debt - from shift work, late-night screen use, or irregular schedules - undermines these repair cycles and may prolong the shedding phase.

What Helps During and After Telogen Effluvium

Addressing telogen effluvium works best when the underlying trigger is identified and managed. Treating only the hair without addressing what caused the shedding typically produces limited results.

Steps that support recovery include:

• Getting blood work done to check ferritin, Vitamin D, B12, thyroid function, and zinc levels - especially important in the UAE where Vitamin D deficiency and iron insufficiency are common findings

• Rebuilding nutritional gaps through food first, with targeted supplementation under guidance when levels are confirmed low

• Managing sleep consistently - aiming for 7–8 hours of regular, uninterrupted sleep supports hormonal balance and cellular repair

• Reducing scalp barrier damage from hard water by using filtered water for rinsing or a chelating shampoo periodically

• Managing stress through practical, sustainable routines - not eliminating stress entirely (which is unrealistic) but reducing the chronic burden through activity, rest, and social connection

Recovery from telogen effluvium typically takes 3–6 months after the trigger is resolved, though the timeline varies depending on the severity of the episode and how quickly the root cause is addressed.

Red Flags to Watch For

Telogen effluvium is temporary in most cases, but certain signs suggest the shedding may be connected to something that needs medical evaluation.

Shedding that continues beyond 6 months without improvement is considered chronic telogen effluvium and warrants investigation. Visible scalp patches, complete areas of hair absence, significant eyebrow or eyelash loss, or shedding accompanied by symptoms like fatigue, unexplained weight changes, or joint pain all indicate the need for professional assessment. Similarly, if shedding began without any clear trigger - no illness, no dietary change, no significant stress - an underlying condition may be contributing.

When to See a Doctor in the UAE

Dermatologists, trichologists, and general practitioners across the UAE are well-positioned to investigate hair shedding. A proper evaluation typically involves a clinical examination of the scalp, a review of health history, and targeted blood tests.

Seeking help sooner rather than later makes a practical difference. Early identification of a deficiency or hormonal imbalance allows for faster correction, which in turn shortens the recovery period.

Most major hospitals and specialised hair clinics in Dubai, Abu Dhabi, and Sharjah offer trichology consultations. If blood test results come back within normal ranges and shedding continues, a referral to an endocrinologist or dermatologist with a hair specialisation is a reasonable next step.

A Root-Cause Approach: Traya's Perspective

Hair shedding rarely has a single cause, and telogen effluvium is a clear example of this. What looks like a scalp problem often has its origins in nutritional gaps, hormonal shifts, or sustained stress - all of which require different approaches.

Traya works across three sciences - Ayurveda, dermatology, and nutrition - because most hair fall cases involve overlapping triggers. Ayurveda addresses internal imbalances related to stress, digestion, sleep quality, and lifestyle patterns that affect hair health at a systemic level. Dermatology brings evidence-based guidance for the scalp and follicle environment. Nutrition identifies and addresses micronutrient deficiencies that directly affect the hair growth cycle.

For residents in the UAE, individual factors like dietary patterns influenced by local food habits, the impact of hard water, shift work sleep disruption, and heat-related stress are taken into account when assessing what may be contributing to shedding. Plans are personalised based on health history, current lifestyle, and stage of hair loss - not applied as a generic template.

Results depend on individual factors and consistency. No approach can guarantee outcomes, but understanding your specific triggers is the most meaningful first step. Taking the Traya Hair Test is a starting point for identifying what might be driving your shedding based on your personal health and lifestyle profile.

Frequently Asked Questions

What is the most common cause of telogen effluvium?

Physical or emotional stress is among the most frequently reported triggers, followed closely by nutritional deficiencies - particularly low ferritin and Vitamin D - and hormonal changes such as postpartum shifts or thyroid dysfunction. In many cases, more than one trigger is involved at the same time.

How long does telogen effluvium last?

Most episodes resolve within 3–6 months after the triggering cause has been identified and addressed. Chronic telogen effluvium, where shedding persists beyond 6 months, is less common and typically requires further investigation to identify an ongoing underlying factor.

Is telogen effluvium permanent?

Telogen effluvium is not permanent in the majority of cases. The follicles are not destroyed - they are resting. Once the trigger resolves and the body recovers, follicles typically return to their normal growth cycle. However, if an underlying cause remains unaddressed, shedding can continue.

Can hard water in the UAE cause telogen effluvium?

Hard water does not directly cause telogen effluvium, as this condition originates from internal systemic triggers. However, hard water can damage the scalp barrier and hair shaft, which may worsen the visible impact of shedding and slow recovery. Using filtered or softened water for hair rinsing may support scalp health during recovery.

Does stress from UAE work culture trigger hair shedding?

Sustained high stress - common in demanding work environments with long hours, irregular schedules, or burnout - elevates cortisol levels over time. This hormonal disruption can push follicles into the resting phase, leading to telogen effluvium. The shedding typically appears 2–3 months after the period of significant stress.

How is telogen effluvium different from pattern hair loss?

Telogen effluvium causes diffuse shedding across the scalp without a defined pattern and is triggered by a specific event or internal disruption. Pattern hair loss (androgenetic alopecia) follows a predictable progression - temple recession and crown thinning in men, central parting widening in women - and is driven by genetic sensitivity to DHT. Both can occur at the same time, which is why professional evaluation helps distinguish them.

What blood tests should I ask for if I suspect telogen effluvium?

Relevant tests typically include serum ferritin (not just haemoglobin), complete blood count, Vitamin D (25-OH), Vitamin B12, thyroid function tests (TSH, T3, T4), and zinc. In the UAE, Vitamin D deficiency and low ferritin are particularly common findings, even in individuals who appear otherwise healthy.

Can diet changes alone stop telogen effluvium?

If nutritional deficiency is the primary trigger, improving dietary intake can make a meaningful difference. A protein-adequate diet with sufficient iron-rich foods, Vitamin D sources, and micronutrient variety supports follicle recovery. However, if the trigger is hormonal, stress-related, or medication-linked, dietary changes alone are unlikely to fully resolve the shedding without also addressing those root causes.