Shingles (herpes zoster) is caused by the reactivation of the same virus that causes chickenpox, called the varicella-zoster virus (VZV). After chickenpox symptoms clear, VZV doesn't disappear but ...

Headaches that present to an ophthalmologist include migraine, facial pain syndromes, and pain associated with cranial neuropathies, orbital, and ocular disease. Some headaches are symptoms of ...