What Causes Cold Sores and Fever Blisters

Cold sores and fever blisters are caused by the herpes simplex virus (HSV-1), which affects up to 70% of the UK population. Understanding the triggers and early warning signs can help you manage outbreaks effectively. While there's no cure, antiviral treatments like aciclovir can significantly reduce symptoms and healing time when started early.

  • Herpes simplex virus type 1 (HSV-1) is the primary cause of cold sores around the mouth
  • Common triggers include stress, illness, sun exposure, and hormonal changes
  • Early treatment with antivirals can reduce outbreak severity and duration
  • Proper lip care and hygiene help prevent spread and secondary infections
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Available Treatments

Choose from a wide range of clinically-proven, safe, and effective treatments for Cold Sore.

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Aciclovir Tablets

From £12.99

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Aciclovir 5% Cream

From £8.99

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Valaciclovir

From £18.99

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Valtrex

From £34.99

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Understanding Cold Sore Triggers and Treatment Options

Primary Causes of Cold Sores

Cold sores are caused by herpes simplex virus type 1 (HSV-1), which remains dormant in nerve cells after initial infection. The virus can reactivate due to various triggers, leading to recurrent outbreaks. Once infected, the virus stays in your system permanently, though many people never experience symptoms.

Common Cold Sore Triggers

Several factors can trigger cold sore outbreaks. Stress and fatigue are among the most common triggers, as they weaken the immune system's ability to keep the virus dormant. Sun exposure, particularly UV radiation on the lips, frequently causes outbreaks in susceptible individuals. Other triggers include illness (especially fever), hormonal changes during menstruation or pregnancy, and physical trauma to the lip area.

Antiviral Treatment Options

Aciclovir remains the gold standard treatment for cold sores, available as both tablets and topical cream. When taken at the first sign of symptoms, aciclovir 400mg tablets can reduce outbreak duration from 7-10 days to approximately 4-6 days. EverydayMeds offers both aciclovir tablets and cream formulations for comprehensive cold sore management.

Effective Lip Care Strategies

Proper lip care plays a crucial role in preventing outbreaks and managing symptoms. Use lip balm with SPF 15 or higher daily to protect against UV triggers. During active outbreaks, avoid touching or picking at blisters to prevent bacterial infection and scarring. Replace lip products after outbreaks to avoid reinfection, and maintain good hand hygiene when applying treatments.

Prevention and Management

While you cannot completely prevent cold sore outbreaks, you can reduce their frequency and severity. Identify and avoid personal triggers where possible, maintain a healthy immune system through proper nutrition and stress management, and consider suppressive antiviral therapy if outbreaks are frequent. EverydayMeds provides access to prescription antivirals including aciclovir and valaciclovir for both acute treatment and prevention strategies.

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