You reach for your brush and pull out more hair than seems normal. Or you notice it in the shower drain, on your pillow, or in the way your part has gradually started to look wider than it used to.

Hair loss is one of those things that people tend to either panic about immediately or wave off completely. The reality sits somewhere in the middle. Losing some hair every day is completely normal. Losing noticeably more than usual is worth paying attention to, because it almost always means something else is going on.

Why Hair Falls Out in the First Place

Every hair on your head goes through a growth cycle. There is an active growth phase that lasts two to six years, a transitional phase, and then a resting phase where the hair eventually falls out and a new one starts growing in its place. On any given day you have hairs at every stage of this cycle, and losing 50 to 100 of them daily is completely normal.

What is not normal is when a large proportion of hairs shift into the resting and shedding phase at the same time, or when hair follicles stop producing new growth efficiently. Both of these things can happen for a range of reasons, most of which have nothing to do with genetics.

The medical term for sudden, diffuse hair shedding is telogen effluvium. It typically shows up two to four months after a triggering event, which is part of why it is so often confusing. By the time you notice the shedding, whatever caused it may feel long past.

What Is Actually Behind It

Iron deficiency is one of the most commonly missed causes of hair loss in Canada, particularly in women. Iron is essential for producing the protein that hair cells need to grow. When ferritin levels are low, even if they are not technically in the anemic range, hair follicles are often the first place the body pulls resources from. People with heavy periods, those eating plant-based diets, and anyone who has recently been pregnant are especially at risk.

Thyroid problems are another major culprit that often gets overlooked. Both an underactive and an overactive thyroid can disrupt the hair growth cycle. With hypothyroidism, hair often becomes thinner, drier, and more brittle across the whole scalp. With hyperthyroidism, the shedding tends to be more diffuse. In both cases the hair loss is a symptom of the underlying thyroid issue, and treating the thyroid typically leads to regrowth over several months.

Hormonal shifts are behind a large proportion of hair loss in women specifically. Postpartum hair shedding is extremely common and usually resolves on its own within a year. The hormonal changes that come with perimenopause and menopause can trigger significant thinning, often at the crown and temples. Stopping or switching hormonal contraceptives can also trigger a temporary shed.

Protein deficiency is underappreciated as a cause of hair loss. Hair is made almost entirely of a protein called keratin, and when the body is not getting enough dietary protein, hair production slows down or stops. This is more common than people think, particularly among those following very low-calorie diets or who have recently had bariatric surgery.

Stress, illness, and surgery can all trigger telogen effluvium. A serious infection, a major surgery, a prolonged period of psychological stress, or even a high fever can push a significant number of follicles into the resting phase simultaneously. The resulting shed typically shows up weeks to months later, which is why the connection is not always obvious.

Signs People Write Off

A lot of people chalk hair loss up to getting older and leave it there. A few things worth paying more attention to: hair coming out in clumps rather than individual strands, noticeable thinning at the crown or temples rather than overall shedding, a widening part that has changed visibly over months, patches of hair loss rather than diffuse thinning, and hair loss that is accompanied by other symptoms like fatigue, feeling cold, or changes in your skin or nails.

Any of these patterns is worth mentioning to a doctor because they can help point toward a specific cause.

What Most People Get Wrong

The most common mistake is reaching for supplements or topical treatments before figuring out what is actually causing the loss. Biotin supplements are heavily marketed for hair health, but the evidence that they help anyone who is not already biotin deficient is pretty thin. Spending money on hair serums and growth shampoos when the real issue is low ferritin or an underactive thyroid is not going to do much.

The other frequent mistake is waiting too long to get checked. Hair loss from treatable causes like iron deficiency or thyroid dysfunction responds well to treatment, but regrowth takes time. The longer the underlying issue goes unaddressed, the longer it takes to recover.

What Actually Helps

Getting a blood panel is the most useful first step. Ask your doctor to check ferritin specifically, not just hemoglobin, because iron deficiency can affect hair long before it causes anemia. Thyroid function, vitamin D, and zinc are also worth checking, as deficiencies in all of these have been linked to increased hair shedding.

Ensuring adequate protein intake is important and often overlooked. Most adults need at least 0.8 grams of protein per kilogram of body weight per day, and people who are active or recovering from illness may need more. Eggs, legumes, fish, poultry, and Greek yogurt are all reliable sources.

Reducing heat styling and harsh chemical treatments will not fix an internal cause of hair loss, but it does reduce additional breakage that can make the situation look worse. Being gentle with wet hair, which is more fragile than dry hair, also helps.

If bloodwork comes back normal and hair loss is continuing, a referral to a dermatologist who specializes in hair conditions is the next step. Conditions like alopecia areata, which involves immune-driven hair loss in patches, and androgenetic alopecia, which is pattern baldness, both have effective treatments but benefit from proper diagnosis.

When to See a Doctor

If you are noticing noticeably more shedding than usual and it has been going on for more than a couple of months, it is worth booking an appointment. If hair loss is patchy, if it came on suddenly, if it is accompanied by other symptoms like fatigue, weight changes, or skin changes, or if it is causing you real distress, do not wait.

A simple blood test can rule out the most common internal causes. And if it turns out to be something that needs a specialist, your doctor can point you in the right direction.

Hair loss is common. It is also frequently treatable once you know what is driving it.

👉 Find a doctor or clinic near you: https://medimap.ca

Always speak with a qualified healthcare provider before making changes to your health routine. This article is for informational purposes only.