Apple Watch CAUSING health issues?

I gave my Apple Watch (Gen 1) to my 20yo Daughter in November last year.

Shortly after she started getting really bad migraines and also some tachycardia.

My wife was talking to a friend today that said that they knew someone else who had a similar correlation between an Apple Watch and migraines and tachycardia. They stopped wearing the Apple Watch and the issues went away.

I'm highly sceptical that the Apple Watch caused the issues and I'm a big one for understanding the differences between correlation and causation, but I'm interested in others experiences and views on this.

<Edited by Host>