The week after the fight

The first 24 hours after a fight have their own page. This is about the 6 days that follow, which nobody plans and where three things happen that catch people out.

The part that is actually dangerous

A study of 30 fighters, 15 in mixed martial arts and 15 in muay thai, took urine and blood samples at 3 points: before the weight cut began, on official weigh-in day, and on fight day.

On both weigh-in day and fight day the athletes showed glycosuria, leukocyturia and proteinuria. The authors concluded that these findings suggest acute kidney damage, driven by severe dehydration, reduced renal blood flow and impaired filtration under metabolic strain.

Read the timing rather than the terminology. The kidney is showing markers of injury on the day of the fight, before the fight has happened, purely from the cut.

Now consider what a fighter does that night.

He is sore in a way he will not be again for months. Something is swollen, something is cut, his hands hurt, and there is anti-inflammatory medication in every bag in the changing room.

So he takes ibuprofen, or somebody hands it to him, and nobody in the room treats that as a decision.

And the fight itself adds the third element

Blunt trauma breaks down muscle tissue. Low kicks, body shots and being thrown all release myoglobin into the bloodstream, and clearing myoglobin is work the kidney has to do.

So the night after a fight assembles all three components at once: dehydration, a myoglobin load from tissue damage, and an anti-inflammatory that reduces the kidney's ability to handle either.

That is the same combination set out under stopping a cut, and the fight has supplied the exertion.

So what instead

The decision belongs with a doctor and this page will not prescribe. What belongs here is that a decision exists, which is the part currently missing.

Paracetamol works through a different mechanism and does not carry the same renal profile, which is why it is the more common recommendation in this situation.

It carries its own cost. It is metabolised in the liver into a toxic intermediate that the body then has to neutralise, and alcohol increases that burden substantially. On a night when both are likely, that combination deserves more thought than it usually gets.

Rehydrate before medicating. Whatever you take lands better in a body with fluid in it.

And if you are taking anything for several days rather than one night, that is a conversation with a doctor rather than a matter of personal tolerance.

The weight comes back and it looks alarming

A fighter who steps on a scale 5 days after competing may see a number 5 or 6 kilograms above his fighting weight, sometimes more.

That produces a predictable reaction and it is the wrong one. Almost none of it is fat.

The first three are the weight you removed and are supposed to get back. Treating their return as a failure is how a fighter ends a week of legitimate recovery by starting a diet.

And the swelling that gets misread

Something else happens in these days and it is regularly mistaken for fat or for injury.

The hormonal systems that were reabsorbing sodium and water during the cut do not switch off the moment the fight ends. Aldosterone and vasopressin remain elevated for a period afterwards.

Into that state arrives a sudden return to salty, high-carbohydrate food.

The result is visible oedema: puffy feet, ankles, hands and face, and joints that feel thick. Fighters read it as inflammation from the fight or as having got fat in 4 days, and it is neither.

It resolves as the hormonal picture normalises. Returning to normal eating gradually rather than in one evening reduces how pronounced it gets.

The decision that matters more than the number

The real question is where the weight settles, more than how fast it returns.

A fighter who eats freely for 4 days and then returns to normal eating is in a good position. A fighter who eats freely for 6 weeks because nothing is booked is having a different conversation in 3 months.

The material on between fights covers walking-around weight. The point for this week is that the immediate rebound is not the thing to react to, and the drift that follows it is.

Give it 2 weeks before drawing any conclusion from a scale. Anything read before then is measuring the recovery rather than the outcome.

The third thing nobody warns you about

The mood drops, and it is a documented phenomenon with a name.

Post-competition blues is described in the sport psychology literature as an emotional response following a competitive event, with reported features including fatigue, low mood, irritability, disturbed sleep, changes in appetite, restlessness and loss of enjoyment in things usually enjoyed.

It has an identifiable trigger, typically lasts a few weeks, and usually resolves.

Two things make it worse in this sport.

The cut contributes. Rapid weight loss has been associated with increased anxiety, mood disturbance and disordered eating behaviours, and those effects do not stop at the weigh-in.

And the void is larger. A camp organises everything: when you wake, what you eat, where you are, what you are for. When it ends, all of that ends at once. The literature identifies poor adjustment to that void as a causal factor, particularly in athletes whose identity comes mainly from the sport.

There is a physiological layer underneath it too. Catecholamines, cortisol and endorphins are elevated through fight week and around the contest, and they come down afterwards. Feeling flat when they do is what that descent feels like.

Winning does not prevent it. That surprises people, so I will say it plainly.

Where it stops being normal

The distinction the literature draws is between an expected response and a clinical one.

The expected version has a clear trigger, lasts a few weeks and lifts. It responds to time, sleep, food and the arrival of a new goal.

If it does not lift, if it deepens, or if it involves thoughts of harming yourself, that is not post-competition blues and it needs a professional rather than another camp.

A fighter who recognises that second description should talk to a doctor. There is nothing in this sport worth more than that, and the culture around it is wrong about almost everything to do with this subject.

And what it does to eating

Low mood after competition affects appetite in both directions. Some fighters cannot eat and lose more weight in the recovery week than they did in the cut. Others eat constantly, and alcohol frequently accompanies it.

Both patterns are self-reinforcing: poor eating worsens mood, worsened mood worsens eating.

• Eat at roughly normal times even without appetite.
• Get outside during daylight.
• Sleep on a schedule rather than whenever.
• Put something in the calendar within 2 weeks that is not a fight. The void closes faster when something occupies it.

And flying home

If you compete abroad, the journey lands directly in the middle of all this.

You are dehydrated, sore, sleeping badly and crossing time zones, and the flight adds its own fluid loss to a body that has not finished replacing what it lost.

Drink more than you think on the aircraft. Do not treat the flight as the celebration. And expect the mood drop on the far side of it rather than before, because the travel occupies the days that would otherwise be empty.

The week in one paragraph

Your kidneys have had a worse week than your face has, and the medication that helps the second one works against the first.

The weight coming back is the weight you removed, and reacting to it is how a good week becomes a bad month.

And feeling flat afterwards is normal, documented, worse after a hard cut, and unrelated to whether your hand was raised.

Everything on this site about preparation assumes you arrive at the next camp in reasonable condition. This is the week that decides whether you do.