Cycle context can help you remember when a check-in occurred. It is most useful as one piece of the journal, not as an automatic explanation or diagnosis.
Keep the scope observational
Record the context you choose to share and let it sit beside photos, notes and other information. Avoid assuming that a visual or measurement change has one cause based on timing alone.
Choose manual or selected health data
Body Log can keep cycle context you enter and can read menstrual-flow information you choose to share from Apple Health. The app does not write body or cycle data back to Apple Health.
Protect health context like the rest of the journal
Cycle information is private. It stays inside the same local Body Log record and behind the same passcode and biometric access controls as other check-in data.
Know when the journal is not the right tool
A progress journal can preserve observations, but it does not diagnose symptoms or replace healthcare advice. Questions about pain, unusual changes or health concerns belong with a qualified clinician.
The takeaway
Use cycle information as optional timing context, keep conclusions modest and take health concerns to a qualified professional.
Body Log articles are general educational material about keeping a personal record. They are not medical advice or a substitute for professional care.