"My Hair Started Falling Out After the Flu. Will It Grow Back?" A Houston Hair Loss Specialist Explains
If you've recently recovered from the flu, COVID-19, or another serious illness and suddenly notice handfuls of hair coming out in the shower, you're not imagining it. Viral illnesses are one of the most common triggers for telogen effluvium, a temporary form of hair shedding. But sometimes, that sudden shedding uncovers another condition that has been quietly developing beneath the surface.
Recently, a 29-year-old woman came to our hair loss clinic in Houston after noticing increased hair thinning over the previous month. She had recovered from influenza several months earlier, and the shedding seemed to accelerate afterward. During her evaluation, we discovered that her hair loss was likely caused by two different conditions occurring at the same time.
Here's why that distinction matters—and how we approach diagnosing and treating it.
The Patient's Story
Our patient noticed gradual thinning along both temples that had become noticeably worse over the previous month.
One important clue emerged during her medical history:
She had experienced influenza earlier in the year.
Recent illnesses place tremendous stress on the body and can push a large number of hair follicles into their resting phase. This often leads to increased shedding several weeks to months after recovery.
However, after examining her scalp with dermoscopy, the pattern of thinning suggested something more than temporary shedding alone.
Her clinical findings were most consistent with androgenetic alopecia (female pattern hair loss) with a possible superimposed episode of telogen effluvium.
What Is Telogen Effluvium?
Telogen effluvium is a temporary condition in which an unusually high number of hair follicles enter the resting (telogen) phase of the hair growth cycle.
Common triggers include:
Influenza
COVID-19
High fever
Major surgery
Childbirth
Rapid weight loss
Significant emotional stress
Certain medications
Because hair follicles respond slowly, shedding usually begins two to three months after the triggering event, which often surprises patients.
The good news is that telogen effluvium is usually reversible once the body recovers.
What Is Female Pattern Hair Loss?
Unlike telogen effluvium, female pattern hair loss (androgenetic alopecia) is a chronic, inherited condition.
Instead of causing sudden shedding, androgenetic alopecia gradually causes hair follicles to shrink over time.
Women often notice:
Widening of the central part
Thinning near the temples
Reduced ponytail volume
Increased scalp visibility
Progressive loss of hair density
Many women have no idea they have androgenetic alopecia until an illness causes telogen effluvium, making the underlying thinning much more noticeable.
Why Diagnosing the Right Cause Matters
Not every patient with hair loss needs the same treatment.
In this case, we wanted to determine:
Was the shedding caused entirely by telogen effluvium?
Was there underlying androgenetic alopecia?
Were nutritional or hormonal abnormalities contributing?
Could another scalp disorder be involved?
Because multiple conditions can occur simultaneously, a careful evaluation helps us build the most effective treatment plan.
Why We Ordered Comprehensive Blood Work
Hair growth depends on many different factors, including overall health and nutrition.
To identify potentially reversible contributors, we ordered a comprehensive laboratory evaluation that included:
Ferritin (iron stores)
Iron studies
Vitamin D
Vitamin B12
Zinc
Thyroid function (TSH and Free T4)
Complete blood count (CBC)
Comprehensive metabolic panel
Testosterone levels
DHEA-S
Prolactin
Morning cortisol
Potassium
Lipid panel
While many patients have completely normal laboratory results, identifying and correcting deficiencies can improve overall hair health and optimize treatment outcomes.
Would a Scalp Biopsy Help?
Because her examination suggested both androgenetic alopecia and possible telogen effluvium, we discussed performing a punch biopsy of the scalp.
A scalp biopsy can sometimes help distinguish between different causes of hair loss by allowing microscopic evaluation of the hair follicles.
Although not every patient requires one, biopsy can be extremely helpful when the diagnosis is uncertain or when multiple conditions are suspected.
Hair Loss Treatment Options
We reviewed a wide range of treatment options based on her diagnosis and future goals.
These included:
Oral minoxidil
Topical minoxidil (Rogaine®)
Spironolactone
Finasteride (when appropriate)
Low-level laser therapy
Hair growth supplements such as Nutrafol®, Viviscal®, or Votesse®
Platelet-Rich Plasma (PRP)
Alma TED® needle-free hair restoration
Hair transplantation for carefully selected candidates
Because every patient has different priorities, we discussed the risks, benefits, expected timeline, and cost of each option.
At this time, the patient preferred to begin with laboratory evaluation and consultation with a functional medicine physician before deciding on medical treatment.
An Often Overlooked Cause of Hair Shedding: Seborrheic Dermatitis
During her examination, we also diagnosed seborrheic dermatitis of the scalp.
This chronic inflammatory condition commonly causes:
Flaking
Itching
Mild redness
Oily scale
Although seborrheic dermatitis does not directly cause androgenetic alopecia, scalp inflammation can contribute to increased shedding and create a less favorable environment for healthy hair growth.
To improve scalp health, we prescribed ketoconazole 2% shampoo to be used regularly and recommended alternating it with over-the-counter anti-inflammatory shampoos.
Hair Loss Is Often Multifactorial
One of the biggest misconceptions about hair loss is that there is always a single cause.
In reality, many patients have more than one contributing factor.
A patient may experience:
Genetic hair loss
Temporary telogen effluvium after illness
Nutritional deficiencies
Hormonal changes
Scalp inflammation
Successfully treating hair loss means identifying every contributing factor—not just the most obvious one.
Expert Hair Loss Evaluation in Houston and Katy, Texas
If you've recently recovered from the flu, COVID-19, or another illness and are now noticing increased hair shedding, don't assume it's "just stress."
A comprehensive evaluation can determine whether you're experiencing temporary telogen effluvium, underlying female pattern hair loss, or another treatable condition.
At Reena Jogi, MD, we specialize in diagnosing complex hair loss using advanced scalp examinations, laboratory testing, scalp biopsy when appropriate, and individualized treatment plans that may include oral minoxidil, PRP Hair Restoration, Alma TED®, low-level laser therapy, and evidence-based medical treatments.
If you're looking for an experienced hair loss specialist in Houston or Katy, Texas, schedule a consultation today and take the first step toward healthier, fuller hair.
