In a medical emergency, every second counts. Quick access to accurate health information can mean the difference between life and death — especially for older adults with complex medical needs. One simple but powerful tool built into every iPhone can help: the medical ID feature.

In 2017, I was stung by a nest of hornets and needed emergency care. The EMT told me I was the first person he’d met who used the Medical ID feature on their phone. Instead of asking many questions while I was in crisis, he simply looked at my Medical ID — all my important medical information was right there. That experience showed me how vital this feature can be.

Medical ID is part of Apple’s Health app and stores essential health details — medical conditions, allergies, medications, blood type and emergency contacts. Emergency responders can access this info from the iPhone’s lock screen, even if the phone is locked, saving precious time.

This article focuses on Apple products because they are the devices I primarily use and know best. However, Android phones have a similar feature called “Emergency Information” or “Medical Info,” usually found in Settings under “Safety & Emergency” or “Lock Screen.” Many smartwatches running WearOS, like Samsung Galaxy Watches, offer “Emergency SOS” or “Medical Information.” If you use other brands, check your device’s support site for instructions on setting up emergency medical info.

Medical ID came to iPhones with iOS 8 in 2014 and to Apple Watch with watchOS 3 in 2016, making this life-saving tool widely available.

Older adults often manage multiple medications or chronic conditions. In emergencies, they might not communicate these details clearly. For those with cognitive decline, Medical ID is especially important — it tells first responders about memory issues and who to contact, ensuring timely care and notification.

Setting up Medical ID for an Apple iPhone takes just a few minutes:

Open the Health app.

Tap your profile icon in the top-right corner.

Select Medical ID and tap Edit.

Add medical conditions, allergies, medications and emergency contacts.

Turn on “Show When Locked” so info is accessible in emergencies.

Tap Done to save.

If you wear an Apple Watch, Medical ID is accessible from your wrist. Hold the side button until the Emergency SOS screen appears, then swipe the Medical ID slider — no passcode needed. The watch syncs automatically with your iPhone’s Medical ID.

Review and update your Medical ID regularly, especially after changes in medications, conditions or contacts, so first responders have accurate info.

If setting this up feels tricky, ask a trusted friend, caregiver or visit your local senior center for help. Many communities offer tech support for seniors.

Medical ID is free and easy to use on iPhones and Apple Watches. For older adults, setting it up — or getting help — could save a life. Once your Medical ID is updated, share the tip with friends so they can update theirs too. You’re protecting not just yourself, but others.

Rest assured, your Medical ID info is private and only accessible from the lock screen during emergencies — it won’t be visible otherwise.

No matter your age, this simple tool could save your life. Have you set up your Medical ID yet? If not, why wait?