The Ramblings of an Accountant

It's correct. Although it's something you always have you do experience "attacks" as in flare ups. As you poitned out she always has cold hands but they don't always bother her. Gout is another good example, you always have an inability to process uric acid but only sometimes does it crystalise and cause pain.

Migraines by contrast are transient.

I'll step down from my soap box now!