Why Do Men Get Hit Harder By The Flu Than Women? Science Explains Why

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Picture this: your female colleague catches a nasty bug, downs two Panadols, finishes her client deck, and still manages to pack lunch from the local coffee shop

Meanwhile, her brother catches the exact same virus and acts as though he has entered the final stages of a Victorian plague, wrapped in three blankets while groaning about the room spinning.

For decades, the running joke has been that men are melodramatic babies when their temperature ticks up past 37.5°C.

Here is the thing, though: biology is genuinely playing favourites.

It turns out that when men look like they are about to see the light over a basic viral fever, they are not necessarily putting on a show.

There is legitimate, peer-reviewed science behind why males feel fevers more intensely, and it mostly boils down to hormones, immunology, and a bit of evolutionary irony.

Hormones play a major role in the war against the virus

Let me explain using an analogy most of us can picture: your immune system operates like a logistics centre. When a pathogen invades, your white blood cells need immediate clearance to deploy defensive proteins, chiefly antibodies and cytokines, to torch the intruder.

Female biology carries a massive chemical advantage here: oestrogen.

Oestrogen acts like an energetic expediter on the warehouse floor. It stimulates immune cells to churn out antibodies faster and enhances the activity of macrophages (the cells that swallow up cellular debris).

Women also carry two X chromosomes; the X chromosome houses a high concentration of immune-related genes. While one X chromosome is mostly silenced in female cells, some immune genes sneak through and double up on defence.

Testosterone, on the other hand? It does the exact opposite.

High testosterone is an immunosuppressant. It tells the immune system to pump the brakes. It dampens cytokine release, weakens antibody response, and slows down viral clearance. Think of it like pouring high-viscosity gearbox oil into a delicate coffee grinder; the mechanism still runs, but it groans under the friction. Because men produce a slower, blunter initial immune counter-attack, the viral load often climbs higher before the body finally mounts a response.

By the time the male body finally hits the panic button, the infection is more entrenched. That means the subsequent counter-strike has to be far more violent.

The brain's thermostat takes a beating

A fever is not caused directly by the virus or bacteria; it is generated by your own brain. When immune cells spot a threat, they release pyrogens, chemical messengers that travel straight to the preoptic area of the hypothalamus, the body's internal thermostat. The hypothalamus raises the target body temperature, making the environment inhospitable to harmful invaders.

Now, male brains contain a higher density of certain temperature-regulating receptors in the preoptic area. When pyrogens arrive, that dial spikes hard.

Men also typically carry higher baseline lean muscle mass. Shivering is the body's primary mechanical means of generating rapid heat. With more skeletal muscle contracting involuntarily, men burn through energy rapidly, resulting in intense chills followed by drenching night sweats. That physical expenditure is exhausting.

It leaves them utterly wiped out, shivering on the sofa while their partner wonders how 38°C could cause so much theatrical suffering.

Why would nature design males to be so fragile against viral infections?

Blame evolutionary trade-offs. Historically, high testosterone favoured short-term survival: building dense muscle, competing for territory, hunting, and recovering from physical injury. Investing heavy metabolic energy into an aggressive, hypersensitive immune system was an expensive luxury.

Females, from an evolutionary standpoint, carried the physiological burden of gestation and nursing. Keeping the mother, and by extension, the offspring, alive required a strong immune system. The trade-off is that women are far more prone to autoimmune conditions such as lupus and rheumatoid arthritis, where that hyperactive immune system turns on healthy tissue. Men got a hall pass on autoimmune risks, but the price of admission is getting flattened by standard seasonal bugs

While male complaints during a fever can test anyone's patience, high fevers in adult men do demand a little monitoring

Because men sweat aggressively during high-grade fevers, dehydration sets in quickly. Skip plain tap water alone; grab oral rehydration salts, coconut water, or an isotonic drink like 100 Plus to replace lost electrolytes.

A temperature lingering above 39°C for more than three days, severe chest pain, persistent vomiting, or a sudden rash requires a clinic visit. In tropical regions, dengue, influenza, and leptospirosis masquerade as a standard flu before going downhill fast.

Alternating paracetamol with an NSAID like ibuprofen helps keep the hypothalamic thermostat stable, rather than letting the temperature wildly spike and crash every six hours.

The next time a man in your house looks like a crumpled paper bag because of a fever, cut him some slack. His immune system really is working with a weaker toolkit, even if he still complains about it twice as loud as necessary.

The information provided is for educational and communication purposes only, and it should not be construed as personal medical advice. Information published in this article is not intended to replace, supplant or augment a consultation with a healthcare professional regarding the reader's own medical care.