Symptoms That Need Assessment, Not Tracking
Which symptoms call for urgent or prompt medical assessment instead of more tracking, with emergency steps first and what wearable readings can and cannot tell you.
Content last updated . This page has not been medically reviewed.
If you may be having an emergency, stop reading and get help
This page is general information, not a way to check your own symptoms. Do not wait for a second reading, a trend or an app score.- In the United States, call 911 (or your local emergency number) for possible heart attack or stroke symptoms. Medical sources say a heart attack is a medical emergency and advise not to drive yourself to the hospital. [1] Stroke is also a medical emergency. [2]
- In the United Kingdom, the NHS tells people to call 999 for chest pain that feels tight or squeezing or spreads to the arms, neck or jaw, for severe difficulty breathing, or for signs of stroke. [3][4] Other countries use other numbers. We have not verified them here, so find your local emergency number before you need it.
- If you are thinking about suicide or are in emotional crisis in the United States, call or text 988 (the 988 Suicide & Crisis Lifeline). The Lifeline says it is available 24/7/365, and conversations are free and confidential. [5]
- Poisoning or overdose in the US: Poison Help is 1-800-222-1222. See Poison Help by Country and Poisoning: What to Do First.
Why symptoms outrank numbers
A wearable gives you an estimate from a sensor on your skin. A symptom is information from your body. When the two disagree, the symptom is the one to act on. A normal-looking reading does not rule out a problem, and an alarming one does not confirm one. See Avoiding Self-Diagnosis From Device Readings and Delayed Medical Assessment and False Reassurance.Symptoms that need assessment even when no emergency is clear
The NHS advises seeing a doctor for palpitations that keep returning or are getting more frequent. [6] For any new, worsening, unexplained or frightening symptom, the useful step is a conversation with a clinician, not a longer tracking period.What a tracker cannot do for you
- It is not a diagnosis. The US Food and Drug Administration (FDA) says heart-alert wearables "are not meant to provide diagnoses" and that a notification may sometimes be false and lead to extra tests. [7]
- A cleared feature is narrow. FDA authorization applies to specific software functions, not to every wellness number on the same device. [7] The FDA also states it has not authorized any smartwatch or smart ring to measure or estimate blood glucose on its own. [8]
- A wellness feature has a different status. US FDA policy treats software meant only for maintaining or encouraging a healthy lifestyle, and unrelated to diagnosing or treating disease, as outside its device definition. [9] This is a statement about US regulation, not about accuracy.
Using the device afterward
After you have been assessed, it can be reasonable to bring your data along. See Discussing Wearable Data With a Clinician and Preparing a Useful Data Summary for a Clinician. If checking numbers is itself making you anxious, read Tracking Anxiety and Compulsive Measurement.Frequently asked questions
Should I keep tracking for a few days before deciding to get help?
Not if you have symptoms such as chest pain, severe breathlessness, fainting or signs of stroke. Health services say to call emergency services right away for those. [1][3][2]
My watch says everything is normal but I feel unwell. What now?
Act on how you feel. Consumer devices are not meant to provide diagnoses, and a normal reading does not rule out a problem. [7] Contact a clinician, or emergency services if the symptoms match the table above.
Can a heart-rhythm alert from my watch be wrong?
Yes. The FDA notes a notification may be false. [7] In a large Apple Heart Study, among people who got an irregular pulse notification and returned a monitoring patch, 34% showed atrial fibrillation on the patch. [10] See Consumer ECG and Atrial Fibrillation Features.
Where do I find an emergency number outside the US or UK?
We did not verify other countries' numbers for this page. Check your national health service or government site, and see Poison Help by Country for poison lines we have listed.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Warning signs described by health services
These lists come from public health sources. They are not complete, and having none of them does not mean you are fine.
| Situation | Signs described by the source | What the source says to do |
|---|---|---|
| Possible heart attack | Chest pain or pressure (a tight band, heavy weight or squeezing), pain spreading to the arm, shoulder, neck, jaw or back, shortness of breath, nausea, sweating, lightheadedness [1][3] | Call 911 (US) or 999 (UK) right away. [1][3] |
| Heart attack with little or no chest pain | MedlinePlus says some people, including older adults, people with diabetes and women, may have little or no chest pain, or may have shortness of breath, fatigue and weakness. [1] | Do not rule it out because pain is absent. |
| Possible stroke | The FAST check: face drooping, arm drifting down, slurred speech, time to call for help. [2][4] | Call 911 (US) or 999 (UK). The NHS says to get help even if the symptoms stop after a short time. [4] |
| Palpitations (a heartbeat that feels racing, irregular, pounding or fluttering) | The NHS says they are usually harmless but lists chest pain, shortness of breath and feeling faint or fainting as reasons to call 999. [6] | See a GP if they keep coming back, happen more often, last more than a few minutes, or you have a heart condition or family history. [6] |
References
- MedlinePlus (US National Library of Medicine). Heart attack. Web page. Read 2026-10-22.
- MedlinePlus (US National Library of Medicine). Stroke. Web page. Read 2026-10-22.
- NHS (UK). Heart attack. Web page. Read 2026-10-22.
- NHS (UK). Symptoms of a stroke. Web page. Read 2026-10-22.
- 988 Suicide & Crisis Lifeline (US). Home page. Web page. Read 2026-10-22.
- NHS (UK). Heart palpitations. Web page. Read 2026-10-22.
- US Food and Drug Administration. Post-Market Evaluation of Smartwatch Cardiovascular Notifications. Page content current as of 17 May 2024. Read 2026-10-22.
- US Food and Drug Administration. Do Not Use Smartwatches or Smart Rings to Measure Blood Glucose Levels: FDA Safety Communication. Page content current as of 21 February 2024. Read 2026-10-22.
- US Food and Drug Administration. General Wellness: Policy for Low Risk Devices. Page content current as of 6 January 2026. Read 2026-10-22.
- Perez MV et al. Large-Scale Assessment of a Smartwatch to Identify Atrial Fibrillation. N Engl J Med 2019. PubMed abstract. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.