Hair Shedding vs Hair Loss: How to Tell the Difference
Finding hair in your shower or hairbrush doesn't always mean you're losing your hair. While everyone sheds hair as part of the normal hair cycle, excessive shedding and hair loss are different processes with different causes, treatments, and outcomes. Understanding the difference can help you know when reassurance is enough - and when it's time to see a dermatologist.
Bottom line: Some hair shedding is completely normal. Excessive hair shedding is often temporary, whereas progressive hair loss is more likely to reflect an underlying condition that warrants medical evaluation.
How the Hair Growth Cycle Works
Hair follicles cycle through three main phases:
Anagen (growth phase)
Hair actively grows for several years.
Catagen (transition phase)
Growth slows and the follicle prepares to shed.
Telogen (resting phase)
The hair eventually sheds and a new hair begins to grow.
Because thousands of follicles are in different phases at any given time, daily shedding is normal.
Normal Hair Shedding vs Excessive Shedding (Telogen Effluvium)
First, it's important to know that some hair shedding is completely normal. Most people shed approximately 50–100 hairs each day as part of the normal hair cycle. When shedding becomes excessive, dermatologists often refer to it as telogen effluvium, a condition in which more hairs than usual enter the resting phase and are shed at once.
The key difference is replacement. In normal shedding, lost hairs are continuously replaced by new growing hairs. Hair loss occurs when replacement cannot keep pace with shedding, resulting in visible thinning over time.
This shedding often becomes more noticeable during:
Showering
Brushing or styling
Seasonal changes
Importantly, normal shedding does not cause visible thinning of the hair.
Excessive Shedding (Telogen Effluvium)
In contrast, when a larger number of hairs enter the shedding phase at once, usually in response to a stressful event, the condition is called telogen effluvium.
This can occur after events such as:
Illness or fever
Surgery
Significant stress
Rapid weight loss
Hormonal changes
Iron deficiency or thyroid disorders
Shedding typically begins two to three months after the trigger. Unlike normal shedding, telogen effluvium causes a noticeable increase in hair shedding and may lead to a temporary decrease in overall hair density.
Fortunately, in most cases, telogen effluvium improves once the underlying cause is addressed.
True Hair Loss (Alopecia)
True hair loss occurs when hair follicles miniaturize or stop producing hairs efficiently, or cannot replace shed hairs at a sufficient rate. The most common form of androgenetic alopecia tends to happen slowly and progressively over time.
Common patterns include:
Widening of the part
Gradual thinning on the top of the scalp
Recession of the hairline
Patchy hair loss
These changes may indicate conditions such as male or female pattern hair loss, alopecia areata, or scarring alopecia.
Importantly, these categories are not always mutually exclusive. Someone with female pattern hair loss can also experience excessive shedding (for example, after an illness or significant stress), making diagnosis more nuanced than simply "shedding versus hair loss."
Here’s how to quickly tell the difference:
A Breakdown:
Normal Hair Shedding
Amount: ~50–100 hairs/day
Cause: Normal hair cycle
What you'll notice: Hair volume stays the same
Need treatment? No
Excessive Hair Shedding (Telogen Effluvium)
Amount: Noticeably more than usual
Cause: Stress, illness, childbirth, surgery, weight loss, medications
What you'll notice: More hair in the shower or brush
Need treatment? Sometimes—especially if prolonged
Hair Loss (Alopecia)
Amount: Variable
Cause: Genetics, autoimmune disease, hormonal disorders, scarring disorders
What you'll notice: Widening part, thinning ponytail, bald patches
Need treatment? Often yes
When to See a Dermatologist
Evaluation may be helpful if you notice:
Increasing hair shedding lasting > 6 months
Visible thinning or widening of the part
Patchy areas of hair loss
Scalp symptoms such as itching, burning, or redness
A dermatologist can help determine the underlying cause and recommend appropriate treatment.
The Bottom Line
Seeing hair fall out can be concerning, but shedding is a normal part of the hair growth cycle.
However, persistent shedding, visible thinning, or patchy hair loss may signal an underlying condition.
Early evaluation can help identify the cause and guide effective treatment.
About the Author
Dr. Dawn Queen, MD is a board-certified dermatologist in New York City specializing in medical dermatology, cosmetic dermatology, and hair loss. She serves as a Clinical Assistant Professor of Dermatology at Columbia University and completed an ISHRS-accredited hair restoration fellowship.
Learn more about Dr. Queen.
Frequently Asked Questions
How much hair shedding is normal?
Most people shed about 50–100 hairs per day as part of the normal hair growth cycle.
Because many hairs are shed during washing or brushing, the shedding may appear more noticeable on those days.
Normal shedding does not usually cause visible thinning of the hair.
Can I have both hair shedding and hair loss at the same time?
Yes. For example, patients with female pattern hair loss may also develop telogen effluvium after an illness, surgery, or period of significant stress. In these cases, increased shedding can occur on top of an underlying hair loss condition.
Does washing your hair cause hair loss?
No. Washing or brushing the hair does not cause hair loss.
These activities simply release hairs that were already in the telogen (shedding) phase of the hair cycle.
In fact, if you wash your hair less frequently, shedding can sometimes appear more dramatic, because several days’ worth of naturally shed hairs may come out at once during washing or brushing.
For example, if someone washes their hair once every few days instead of daily, they may simply notice a larger number of shed hairs in a single shower, even though the total amount of shedding is the same.
Seeing hair in the shower drain can look alarming, but most of those hairs were already destined to shed.
Can stress cause hair loss?
Yes. Significant physical or emotional stress can trigger a condition called telogen effluvium, where many hairs enter the shedding phase at the same time.
Common triggers include:
Illness or high fever
Surgery
Rapid weight loss
Childbirth
Severe psychological stress
Shedding typically begins 2–3 months after the trigger. Fortunately, telogen effluvium is usually temporary, although regrowth may take 6–12 months because hair grows slowly.
Can vitamin deficiencies cause hair loss?
Yes. Several nutritional deficiencies can contribute to increased shedding, including:
Low iron levels
Low ferritin
Low vitamin D (possibly, this is debated)
Low protein intake
Low zinc
Hair shedding may also occur after rapid weight loss or very restrictive diets, which can place stress on the hair growth cycle.
Bloodwork may sometimes be recommended to evaluate for underlying contributors.
Does Ozempic cause hair loss?
Some patients taking GLP-1 medications (such as Ozempic) report increased hair shedding.
In most cases, this is not caused directly by the medication itself. Instead, hair shedding may occur because rapid weight loss can trigger telogen effluvium, a temporary condition in which more hairs enter the shedding phase of the hair cycle.
This type of shedding typically begins two to three months after significant weight loss and often improves once weight stabilizes and the hair cycle resets.
Will hair grow back?
In many cases, yes.
When shedding is caused by telogen effluvium, hair growth usually improves once the underlying trigger resolves. However, regrowth may take several months because hair grows slowly.
If shedding persists beyond six months, evaluation by a dermatologist may be helpful to determine if this is something more.
Can hair shedding be the first sign of female pattern hair loss?
Yes. Although female pattern hair loss usually develops gradually, some people first notice increased shedding before visible thinning becomes apparent. A dermatologist can help determine whether you're experiencing temporary shedding, early female pattern hair loss, or both, since treatment recommendations may differ.
Does minoxidil cause hair shedding?
Some people do notice increased shedding during the first several weeks or even months after starting topical or oral minoxidil. This form of shedding is temporary and occurs because hairs are transitioning into a new growth cycle. It does not mean the medication is worsening hair loss and in fact I encourage my patients to continue if they are otherwise tolerating it. If shedding is severe or persists, it's worth discussing with your dermatologist before stopping treatment.
Is it normal to lose more hair at certain times of the year?
Some people experience seasonal increases in shedding, particularly in late summer or early fall. This is thought to be related to normal fluctuations in the hair cycle.
In most cases, this shedding is temporary.
