Hair Loss After COVID-19: Understanding Telogen Effluvium
2026-09-01
Medically reviewed by Dr. Ruaa Alharithy — استشارية
If you have noticed heavy hair shedding after COVID-19 or another illness with fever, the cause may be a temporary condition called telogen effluvium (تساقط الشعر الكربي). It does not scar the scalp, typically begins about three months after the illness or physical stress, and in most cases settles on its own within roughly six months.
What is telogen effluvium?
Telogen effluvium is a diffuse, non-scarring type of hair loss: the shedding is spread across the scalp rather than concentrated in one patch, and the follicles are not permanently damaged. It is a delayed reaction to an event that placed the body under strain. Common triggers include:
- High fever and infections, including COVID-19
- Major surgery
- Childbirth (the reason for the well-known postpartum shedding)
- Severe psychological stress
- Rapid weight loss or nutritional deficiency
- Certain medications, or stopping them abruptly
The shedding usually does not appear during the illness itself, but weeks to about three months afterwards, sometimes after the person feels fully recovered.
Why does hair fall out after an illness? The hair cycle in brief
Every scalp hair moves through a cycle of three main phases:
- Growth phase (anagen): where the large majority of follicles are at any given time; it lasts for years.
- Transition phase (catagen): a short slowing-down stage.
- Resting phase (telogen): the follicle rests for weeks to months, then releases the hair so a new one can grow in its place.
Normally, around 50 to 100 hairs are shed each day without anyone noticing. When the body experiences a strong stressor — such as a high fever or an infection — a large share of follicles shifts from the growth phase into the resting phase at the same time. When that resting period ends, about two to three months later, those hairs are released together, producing the sudden, heavy shedding. The follicles themselves remain healthy and are typically preparing for a new growth cycle.
What did the Saudi study find about hair loss after COVID-19?
A Saudi survey-based (questionnaire) study published in the journal Cureus in 2022 collected responses from 806 participants across the regions of Saudi Arabia who had previously been diagnosed with COVID-19, to explore how common hair loss was after the infection and how it affected quality of life. Key findings included:
- About half of the participants (52.7%) reported noticing hair loss after their COVID-19 infection.
- Shedding was reported more often by women, by those whose infection involved a high fever, and by those who had already dealt with hair loss before catching the virus.
- Many of those who noticed shedding said it began within the first three months after the infection — consistent with the known timing of telogen effluvium.
The study relied on participants' descriptions collected through an online questionnaire, without direct clinical examination of the scalp. Its results reflect self-reported experience rather than proven cause and effect. The researchers recommended follow-up studies using objective assessment tools.
The emotional impact of hair loss
The same study measured quality of life using the Dermatology Life Quality Index (DLQI). Most participants (91.4%) did not report a severe impact, while 8.6% described their daily lives as severely affected. Medical advice is appropriate when hair shedding causes significant distress.
Does hair grow back after telogen effluvium?
In most cases, yes. Telogen effluvium is temporary: the follicles are not destroyed, and once the hair cycle returns to its normal rhythm, shedding gradually decreases and new hair grows over the following months. During recovery, you may notice short new hairs along the front hairline. The pace and extent of recovery differ from person to person, and other causes of hair loss can overlap and need medical assessment.
When should you see a doctor?
See a dermatologist if any of the following apply:
- Heavy shedding continues beyond roughly six months
- The loss appears as well-defined round patches — a different pattern from telogen effluvium that may suggest alopecia areata
- You notice scarring, or smooth shiny areas of scalp where follicle openings have disappeared
- Scalp symptoms such as redness, pain, intense itching, or thick scaling, which can accompany other skin conditions such as psoriasis or atopic dermatitis (eczema)
- Signs that could point to another health issue, such as marked fatigue, pallor, weight changes, or menstrual irregularities
- A clear effect on your mood or self-confidence because of the shedding
What to expect at a dermatology visit
Assessment usually starts with your health history (recent illnesses, medications, diet, childbirth, or surgery), followed by an examination of the scalp and hair. The doctor may use dermoscopy (a skin-surface microscope) or a gentle hair-pull test, and sometimes blood tests to check for contributing factors such as iron deficiency or thyroid problems. Various follow-up and treatment options exist depending on the cause; the appropriate approach is decided individually by the doctor after assessment.
This content was medically reviewed by Dr. Roaa Alharthi — Dermatology, Avant Clinics. Review date: July 16, 2026.
Source: a study published in Cureus, 2022 — DOI: 10.7759/cureus.30266
Frequently asked questions
Does hair grow back after telogen effluvium?
In most cases, yes — the follicles are not damaged, and hair typically regrows gradually over the following months once the hair cycle stabilizes. Recovery speed varies between individuals; if shedding lasts beyond roughly six months, see a dermatologist.
When does hair loss after COVID-19 start and stop?
It usually starts weeks to about three months after the infection, continues for several months, then gradually decreases. The typical overall duration is up to about six months.
Is hair loss after COVID-19 the same as alopecia areata?
No. Telogen effluvium is diffuse across the whole scalp, while alopecia areata typically appears as smooth, well-defined round patches. If you notice bare patches, see a dermatologist for a diagnosis.
Do I need blood tests for hair shedding?
Not always, but the doctor may order blood tests to check for contributing factors such as iron deficiency or thyroid problems, depending on your history and examination.