Quiz: Discover the Cause of Your Hair Loss

Events That Can Trigger Hair Loss

The human body is extremely sensitive to changes and stressful events, and hair acts as a true thermometer of our overall health.

Often, significant life events can trigger episodes of hair loss a few months later.

Understanding this connection between specific events and hair loss is crucial to identifying whether your problem is temporary or requires further investigation.

One of the most common and well-documented triggers for hair loss is the postpartum period, that is, after having a baby.

During pregnancy, estrogen levels, which is one of the main female hormones, become much higher than normal.

This elevated estrogen has a protective effect on the hair, keeping more strands in the active growth phase for longer.

That's why many pregnant women notice that their hair becomes fuller, shinier, and seems to grow faster during pregnancy.

They literally have more hair on their heads because fewer strands are entering the resting phase and falling out.

But when the baby is born, hormone levels quickly plummet back to normal within days or weeks.

All those extra hairs that were kept in the growth phase during pregnancy are now receiving the signal to enter the resting phase at the same time.

Between two and six months after giving birth, usually with a peak between three and four months, all of these hairs enter the shedding phase simultaneously.

The mother notices an alarming amount of hair loss, with large amounts coming out in the shower, on the brush, and on the pillow.

It may seem like she's going bald, but in reality, it's just compensation.

During her pregnancy she had extra hair, now it's returning to normal, but because so many strands are falling out at once, it looks dramatic.

This postpartum hair loss is temporary and resolves itself in the vast majority of cases.

Hair usually returns to its normal volume between 6 and 12 months after childbirth without the need for any specific treatment.

It's important to know this so you don't panic and understand that it's part of the body's normal process of recovering from pregnancy.

Another powerful trigger for hair loss is intense physical or emotional stress.

When we go through very stressful situations, the body releases a series of stress-related hormones, mainly cortisol.

These hormones prepare the body to deal with the emergency situation, directing energy and resources to essential functions such as the heart, brain, and muscles.

In this prioritization process, functions that are less essential for immediate survival, such as hair growth, end up being temporarily compromised.

Stress can cause a greater number of follicles to prematurely enter the resting phase.

This happens about 2 to 3 months after the stressful event, which is the time it takes for the follicles to complete the resting phase.

So if you've gone through a very stressful situation, such as the loss of a loved one, a difficult divorce, job loss, a radical life change, or any other emotionally draining situation, you may start to notice increased decline a few months later.

Physical stress also plays a role.

Major surgeries, especially those involving general anesthesia and prolonged recovery time, are interpreted by the body as very stressful events.

Severe infections, very high fevers that last for several days, accidents, hospitalizations—all of these are physical stresses that can trigger falls.

Even drastic weight changes, whether rapid weight loss or rapid weight gain, can be stressful enough to affect your hair.

The good news is that when stress is the cause of hair loss, it is usually temporary.

Once the stressful situation passes and the body recovers, normal hair growth tends to return spontaneously.

But if the stress is chronic, meaning you constantly live in a state of high stress without relief, the decline can become persistent.

Drastic changes in diet are another important and often underestimated trigger.

Hair needs a range of specific nutrients to grow healthily: proteins, iron, zinc, B vitamins, vitamin D, among others.

When you follow a very restrictive diet that eliminates entire food groups or drastically reduces calories, your body may not receive enough of these essential nutrients.

Diets that completely eliminate animal proteins without adequate replacement can lead to protein deficiencies that affect hair.

Extremely low-calorie diets cause the body to go into "economy mode," reducing non-essential functions such as hair growth.

Diets that completely eliminate fats can impair the absorption of fat-soluble vitamins that are important for hair.

The body is intelligent and has a system of priorities.

If available nutrients are scarce, the body will direct those nutrients first to vital organs such as the heart, brain, liver, and kidneys.

Hair is last on the list of priorities, so it's one of the first things to suffer when nutrients are lacking.

People who follow very restrictive diets or who develop eating disorders often experience hair loss as one of the symptoms.

Vegetarians and vegans also need to pay special attention to ensure they are getting all the necessary nutrients through plant-based sources or proper supplementation.

Iron deficiency is particularly common in menstruating women, especially those with heavy menstrual flow, and can cause significant weight loss.

Another important point is that some situations may not seem obvious to you, but they were significant events for your body.

Starting or stopping birth control pills is a hormonal change that can trigger hair loss in some women.

Undergoing cosmetic surgical procedures, even minor ones, is still stressful for the body.

Episodes of flu or COVID-19 with high fever and intense symptoms can be triggers.

Even jet lag on long trips can affect some more sensitive people.

That's why it's so important to create a mental timeline of the last six months to a year and try to identify if there were any significant events.

Often the connection between the event and the fall isn't immediate because there's a two- to three-month gap, so the person doesn't associate one thing with the other.

But when you stop to think and count the months back, you can often identify the trigger.

If you can't identify any specific event that may have triggered the fall, that's also valuable information.

This could indicate that the cause is not a telogen effluvium reactive to some event, but rather an underlying chronic condition such as androgenetic alopecia or some hormonal or nutritional issue that has been developing silently.