Last Updated on Nov 05, 2019

What are the Causes of Cold Sores?

Cold sores are caused by a virus that is highly infectious and is called the herpes simplex virus (HSV). There are actually eight different types of human herpes simplex viruses but only two types can cause cold sores. These two types are categorized as-

  • Herpes simplex virus-1 (HSV- 1) - The herpes simplex virus-1 causes cold sores.
  • Herpes simplex virus-2 (HSV-2) - The herpes virus -2 generally causes genital herpes and at times herpes labialis too.

The most common route by which the herpes virus is transmitted to others is by way of direct skin-to-skin contact. The virus enters the body through a cut inside or around the mouth either by kissing someone with cold sores or brushing up against their lesion accidentally. It is transmitted through oral sex. It can also spread byway of an intermediary object such as an eating utensil, cup, lipstick or lip balm applicator, toothbrush, or even a face towel.

Cold sores can also spread to other areas of the body of an infected person.

  • The herpes simplex virus can cause herpetic whitlow, a painful infection of the fingers.
  • If the herpes virus infects the eye it can cause a chronic corneal ulcer.

The HSV lies in a dormant state in the body and has a tendency to recur. It hides inside the nerve cells closest to the face. As the virus travels along the nerve tissue, the victim feels a tingling sensation. Following this tingly and itchy feeling, the area swells to form one or several painful pimples which become weeping open sores or blisters. The sore heals without leaving a scar.

A person with a cold sore needs to be careful so as not to transmit the infection to others. People with an outbreak should not pick or scratch the blisters and should wash the hands every time after touching it.

What Causes an Outbreak of Cold Sores?

The onset of herpes outbreaks often coincides with those periods when a person's immune system is stressed or weakened. During ‘normal’ times a person's immune system is able to keep the herpes virus in check, but when a person's immune system is compromised the herpes virus is able to overcome a person's natural defenses and cause the formation of a lesion.

Factors that trigger cold sore outbreaks-

  • Emotional stress
  • Physical stress and fatigue
  • Illness (including a cold or flu)
  • Injury to the lips or skin, such as physical trauma or severe chapping
  • Injury to the lips from excessive exposure to bright sunlight or ultraviolet lamps
  • Menstruation or pregnancy
  • An immune system deficiency


Medspec Thursday, July 30, 2009

Beleive it or not ear wax will get rid of a cold sore within 24hours

guest Wednesday, June 9, 2010

willl it hurt?

guest Wednesday, June 23, 2010

what ear wax? from your ear thats just nasty....

lsjfoewil Thursday, January 20, 2011

lol haha true

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