What health features does the Apple Watch Series 11 have?

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The Apple Watch Series 11 packs pretty much every health sensor Apple knows how to put in a watch. Here's what you're actually getting:

Heart stuff: The ECG is real—you can take an actual electrocardiogram and check for atrial fibrillation. Beyond that, it monitors your heart rate 24/7 and will ping you if something seems off (too high, too low, or irregular). The new hypertension detection watches for signs of high blood pressure over time.

Sleep tracking: Now you get a sleep score each morning (0-100) based on how long you slept, how consistent your bedtime is, and how often you woke up. It also tracks sleep stages and can detect signs of sleep apnea, which is actually a big deal—sleep apnea often goes undiagnosed.

The Vitals app: This is pretty useful. It shows your overnight metrics (heart rate, temperature, breathing, blood oxygen, sleep) in one place. More importantly, it alerts you when multiple things are off at once—which often happens when you're getting sick before you feel symptoms.

Blood oxygen: You can check your SpO2 whenever you want. Apple's careful to call this a "wellness feature" rather than a medical tool.

Women's health: Cycle tracking with period and ovulation predictions. The temperature sensor helps improve ovulation estimates by tracking overnight wrist temperature changes.

Safety features: Fall detection (calls emergency services if you fall hard and don't respond), crash detection for car accidents, and emergency SOS. These work internationally too.

The mental health side: There's a mindfulness app with breathing exercises, and you can log your mood daily to track patterns over time.

Is any of this a substitute for actual medical care? No. But for awareness and catching things early? It's genuinely useful.