Your nervous system can get confused when it’s sick and accidentally tell the nerves on the skin to start itching when there’s nothing there to cause it. There is no rash, but your skin may appear irritated if you’ve been scratching a lot. Your brain may send an itch signal to the nerves in your skin, even though there is nothing there to cause it. You can get it from:
- Shingles
- Multiple sclerosis
- Stroke
- Brain tumor
- Nerve damage