Football fever is sweeping Russia ahead of the Euro 2008 semi-finals. In the past week, two newborn babies have been named in honour of national team head coach Guus Hiddink. But beware – a 'football fan' can sometimes become a medical case.

Cardiologists say that whenever there's a major football tournament, you can expect an increase in heart attacks.

For a true supporter, the stresses of following the beautiful game are irrelevant. Millions simply can't help themselves when they tune in to the collective excitement, and give their hearts to the sport.

Doctors are warning not to increase the risk by doing less physical exercise, smoking and drinking heavily during a tournament – especially those lucky enough to be in the stands during matches.

Those who watch in front of a TV screen are supposed to be in less danger.

Of course, it all depends on the outcome of the game.

“Generally, positive emotions are very good for health, especially when people are together at the stadium and when there is a positive situation, but negative ones are bad,” says cardiologist Leo Bokeria.

Just over a week ago, a 20-year-old Austrian woman died from a heart attack during a match between her team and Germany.

Now, Russia is in the midst of football frenzy.

The country has made it into the semi-final of the European Football Championships after beating the Netherlands in the quarter-final.

It's the first time since the Soviet era that Russia's national team has gone so far.

And whatever this Thursday's game with Spain may bring, Russian fans are hoping their team's performance won't force them into hospital.