These two sites are awful. They literally only display links that they get paid for. And they don't even do a good job with it. In some cases the affiliate links are a worse offer than others publicly available.
Shingles, a viral infection of the nerve roots caused by the chickenpox virus, can sometimes lead to a painful complication called post-herpetic neuralgia. Sometimes, a physical stress like cold or sunburn can bring on an attack. Even clothing touching the skin or a cool breeze can cause excruciating pain.
Shingles is caused by the reactivation of the varicella-zoster virus, which is the virus that causes chickenpox. After you have had chickenpox, the varicella-zoster virus lies dormant (inactive) inside your body. It can become reactivated at a later stage and cause shingles. It is not known exactly how the virus is reactivated, but it may be linked to having lowered immunity (protection against infection and diseases).