Causative & risk factors
Post-herpetic neuralgia occurs as a result of nerve damage caused by the varicella zoster virus during a previous attack of herpes zoster (shingles). This condition is more common in older people.
Clinical presentation
Post-herpetic neuralgia is characterized by persistent burning, stabbing or aching pain in a body part previously affected with herpes zoster. The affected area may become so hypersensitive that even a slight touch or a gentle breeze may cause pain. Rarely the underlying muscles may become weak or paralyzed.
Chronic pain can lead to insomnia, fatigue or depression.
Investigations
Previous history of herpes zoster followed by persistent pain at the site of affection is adequate to make a diagnosis of post-herpetic neuralgia.
Treatment
The pain of post-herpetic neuralgia can be relieved by analgesics, anti-convulsants or anti-depressant medications.
Skin patches containing lidocaine or capcaisin are effective in providing temporary pain relief.
Alternative therapies like homoeopathy are known to have excellent scope in treating post-herpetic neuralgia.
