The first signs of alopecia depend on which type you have, but they generally fall into two categories: gradual thinning that creeps up over months or years, or sudden patches of hair loss that appear within weeks. Losing up to 100 hairs a day is normal. If you’re consistently losing more than that, noticing visible thinning, or finding smooth bald spots, something beyond normal shedding is likely going on.
Patchy Hair Loss: Signs of Alopecia Areata
Alopecia areata is an autoimmune condition where your immune system attacks hair follicles. It looks different from other types of hair loss, and the pattern is usually distinctive: smooth, oval-shaped, flesh-colored patches appear suddenly on the scalp or other parts of the body. These patches tend to be well-defined, not a gradual fade.
If you look closely at the edges of a bald patch, you might notice tiny hairs that are thinner at the base and wider at the tip, resembling exclamation points. These “exclamation mark hairs” are a hallmark of alopecia areata. You may also see short, fine hairs growing within the patch, along with small black or yellow dots where hairs have broken off at the surface.
One clue people often overlook: check your nails. Nail pitting, which looks like tiny dents or pinprick-sized holes on your fingernails, is associated with alopecia areata. If you’re seeing both patchy hair loss and changes in your nails, that combination is a strong signal.
Alopecia areata can stay limited to a few patches, but in some cases it progresses. When it spreads across the entire scalp, it’s called alopecia totalis. When it involves the whole body, including eyebrows, eyelashes, and body hair, it’s called alopecia universalis.
Gradual Thinning: Signs of Pattern Hair Loss
The most common form of alopecia is androgenetic alopecia, or pattern hair loss. It affects both men and women but shows up differently in each.
In men, the earliest sign is a receding hairline at the temples. Over time, the hair on the top and front of the scalp thins while the hair along the sides and back remains fuller. A slight recession at the temples alone can be a normal “mature hairline” that develops in your 20s and doesn’t necessarily progress further. The distinction matters: if you notice the recession deepening or the crown thinning in addition to temple changes, that’s more likely active pattern hair loss.
In women, the pattern looks quite different. The hairline usually stays intact, but hair gradually thins across the top of the scalp. The earliest sign is often a widening part line. You might notice your part looks wider than it used to, or your scalp is more visible when your hair is pulled back. Some women also experience thinning along the sides of the scalp. Unlike in men, complete baldness in any area is rare.
Sudden, Heavy Shedding
If you’re finding clumps of hair on your pillow, in the shower drain, or in your hairbrush, and this started relatively suddenly, you may be experiencing telogen effluvium. This is a temporary form of hair loss triggered by a physical or emotional stressor: surgery, childbirth, a high fever, significant weight loss, or extreme stress. The shedding typically begins two to three months after the triggering event.
A healthy scalp sheds about 100 hairs a day. With telogen effluvium, that number can jump to around 300 hairs a day. The hair loss is usually uniform across the scalp rather than concentrated in patches or along the hairline, so you’ll notice overall thinness rather than bald spots. The good news is that once the underlying trigger resolves, hair typically regrows on its own.
What a Dermatologist Looks For
A dermatologist can usually identify the type of alopecia during a physical exam by looking at the pattern and location of hair loss, the condition of the scalp skin, and whether hair follicle openings are still visible.
One of the first things they’ll do is a pull test. The doctor gently grasps about 40 strands of hair from different areas of your scalp and tugs. Normally, zero to two hairs come out. If six or more strands release, that indicates active hair loss. They may also examine pulled hairs under magnification: a rounded bulb at the root means the hair was in its resting phase (normal shedding), while a tapered or pointed root suggests the hair was pulled from its growing phase, which is a sign of a problem.
Using a dermatoscope, a handheld magnifying device, your dermatologist can spot details invisible to the naked eye. In alopecia areata, they’ll look for exclamation mark hairs, black dots (broken hairs at the scalp surface), yellow dots (empty follicle openings plugged with oil), and fine vellus hairs regrowing within bald patches.
Scarring vs. Non-Scarring Hair Loss
One of the most important distinctions a dermatologist makes is whether your hair loss is scarring or non-scarring. In non-scarring types like alopecia areata, pattern hair loss, and telogen effluvium, the hair follicles remain intact beneath the skin even if hair isn’t currently growing from them. That means regrowth is possible.
In scarring alopecia, the follicles are permanently destroyed and replaced by scar tissue. The key visual sign is that the tiny openings in your skin where hairs normally emerge are no longer visible. The affected scalp may look smooth and shiny, and there can be redness or inflammation around the edges of the hair loss. If your scalp feels tender, burns, or itches in the areas where you’re losing hair, scarring alopecia is a possibility that warrants prompt evaluation, since early treatment can prevent further follicle destruction.
Signs You Can Check at Home
Before you see a doctor, there are a few things you can observe yourself to help narrow down what’s happening:
- Part line width: Take photos of your hair part every few months under the same lighting. A gradually widening part is one of the earliest and most reliable signs of pattern hair loss in women.
- Hairline shape: Compare your current hairline to older photos. Recession at the temples that extends beyond a finger’s width above your highest forehead crease suggests active thinning in men.
- Shedding volume: Pay attention to how much hair collects in your brush, shower drain, or on your pillow. A sudden increase, especially if you can pinpoint a stressful event two to three months prior, points toward telogen effluvium.
- Patch shape and texture: Smooth, round bald spots with no redness or scaling are characteristic of alopecia areata. If the skin within the patch looks scarred, discolored, or inflamed, that’s a different category entirely.
- Nail changes: Small pits or dents across multiple fingernails, appearing alongside hair loss, suggest an autoimmune process like alopecia areata.
Blood Tests and Other Workups
Hair loss isn’t always a standalone condition. It can be a symptom of thyroid disorders, iron deficiency, hormonal imbalances, or nutritional gaps. If the pattern of your hair loss doesn’t clearly match a single diagnosis, your doctor will likely order blood work to check thyroid function, iron stores, vitamin D levels, and hormone levels. These tests help rule out treatable underlying causes. In many cases, correcting a deficiency or managing a thyroid condition is enough to stop the shedding and allow regrowth.
If blood work and a physical exam still leave the diagnosis unclear, a scalp biopsy may be recommended. This involves removing a small piece of scalp tissue, typically a few millimeters across, and examining it under a microscope. It’s a quick in-office procedure and is particularly useful for distinguishing between scarring and non-scarring forms of hair loss.