How can I check my blood pressure every day with my watch?

Blood pressure is usually measured with a cuff, usually around the upper arm, although there are cuffs for fingers also. But the cuff must inflate to measure blood pressure, which is not practical for every day use. There are also invasive ways to measure blood pressure, but they are even less practical for every day use.

There are, however, blood pressure cuffs that use an app on the phone to record a reading and report it to the Health app, such as the Withings: https://www.withings.com/us/en/blood-pressure-monitors

It does not have that feature.

ChefZj Said:

"How can I check my blood pressure every day with my watch?"

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You need to recommend this as a feature to Apple.

Recommending this to Apple:

Do Your Part: Report this to Apple. Apple Support wont get back to you directly, but the more feedback Apple receives on this, the more they will know what their customer prefer, and what feature to include in Apple Watch models to come.

Contacting Apple Support:

1. Go here: Feedback - Apple Watch - Apple
2. Select: "Configurability " for the "Feedback Type"
3. Comment: that you want this to be an option, and why. Include the URL of this thread.
4. Proceed from there as necessary.