Get a tan, get a cold sore

Turns out that strong sunlight or ultraviolet (UV) light can trigger cold sores. Seems that not even the boffins can really explain why, but lips are exposed and have a relatively thin covering of skin - so next time you're out in the sun, take extra care.

Weather it well

Winter can be the worst time of year for cold sores, probably something to do with the cold (hence the name). Wrap up well, and try to avoid that chilly wind-burn on lips or areas you’re prone to an attack.

Bit of a no-brainer this one. No one exactly knows why but when you're stressed out, the virus takes advantage and piles on the agony.

Party on, party's off

Talk about a party pooper. The less kip you get, the greater chance for the herpes simplex virus to put in an appearance. That's because lack of sleep affects your immune system.

Got a cold? Get a cold sore

It's pretty obvious really but if you're run down with a cold or flu or other infection, it's the perfect cue for that nasty old herpes simplex virus to pop up its ugly head. Seems that if you get eczema, you can also get cold sores more frequently.

Periods, what a pain

Guess what? The cold sore virus can spring into action around your monthly periods. At least you can be ready for it.

If you ever bump them, burn them or bash them, have you noticed what can happen to your lips? Damage aggravates your immune system and hey presto, a cold sore appears.

Pregnancy

That blue line's like a green light for cold sores. Whether you feel blooming marvellous or blooming terrible, all those changes and stresses are a great opening for the herpes simplex virus. (Zovirax Cold Sore Cream is not recommended for use in pregnancy).