Sex

Herpes

Not that guy who makes posh silk scarves, but an infection caused by the herpes simplex virus spread through oral or physical sex. It can be just a single attack but for many it can last for years as a recurrent problem.

Look for blisters and sores around the mouth and genitals and itching and burning in and around the penis or vagina. First attacks are often accompanied by fever or headaches.

Treatment: There is no real cure, though anti-viral creams and drugs may be given and painkillers can ease discomfort. Try bathing in salty water. Women sufferers should have regular cervical smears because of complications.

Don't have sex while affected with blisters and sores, as herpes spreads easily and condoms do not give complete protection.

Contact: Herpes Association, 41 North Road, London N7