Swine flu is caused by a virus strain known as H1N1 influenza virus according to the NHS.

It is similar to a normal, more common flu, but the symptoms tend to be heavier and can be fatal.

After the virus was diagnosed in the UK last week, it is important to know the signs and symptoms of swine flu.

It is claimed that one of the most common signs of infection is red eyes.

Red or watery eyes could be an early sign of a swine flu infection, revealed pharmacist and Jakemans expert Marvin Munzu.

All swine flu symptoms are similar to those of normal flu, including red-eye, but are usually more severe.

If your eyes are redder than usual and you have a combination of other flu symptoms, you may be at risk for the virus.

"The most common symptoms to watch out for are similar to those of a normal flow," Munzu said.

"The symptoms usually appear one to three days after exposure to the virus, and include watery, red eyes, body aches, cough, and sore throat."

Other common symptoms of swine flu include runny or stuffy nose, headaches and tiredness.

The swine flu is more accompanied by diarrhea and vomiting, warned the pharmacist.

"Swine flu is more likely to include diarrhea and vomiting, as well as all other symptoms of a normal flu.

"Studies have shown that the swine flu strain infects deeper into the lungs than the normal flu, so that the symptoms feel a bit heavier than the normal flu."

If you think you may have swine flu then you should stay home and rest. Take paracetamol or ibuprofen to lower your body temperature and drink plenty of water to avoid dehydration.

Contact a pharmacist for information on the best over-the-counter medicines.

However, it is best to stay at home if you have influenza to prevent further spread of the infection.

However, you should consult a doctor or call the NHS 111 if you believe you are suffering from influenza from a pre-existing condition or if you are over 65 years old.

The warning comes after a pig has been diagnosed with a boy in the UK on a Christmas day.

Robert Brennan, 14, is now fighting for his life after the infection, his mother explained.

All over the Irish Sea, up to four people have died from a swine flu outbreak and Ireland's Health Service Executive (HSE) has warned that more people will get infected in the coming weeks.