Menstrual Cycle Tracking
Definition
A collection of reproductive health data types in HealthKit: - Menstrual Flow - Period days and flow intensity - Ovulation Test Result - Home test results - Cervical Mucus Quality - Fertility sign - Intermenstrual Bleeding - Spotting between periods - Sexual Activity - Optional tracking
Why It Matters
Cycle tracking provides valuable health insights: - Cycle regularity - Identifying normal patterns - Fertility awareness - Understanding fertile windows - Health screening - Irregular cycles may indicate issues - Symptom correlation - Relating symptoms to cycle phase - Medical preparation - Data for healthcare visits
How It's Tracked
- Manual logging - Enter period days, flow intensity
- Apple Cycle Tracking - Built into Health app
- Wrist temperature - Enhances predictions (Series 8+)
- Third-party apps - Many sync with HealthKit
Cycle Basics
| Phase | Typical Timing | Characteristics |
|---|---|---|
| Menstruation | Days 1-5 | Period bleeding |
| Follicular | Days 1-13 | Egg developing |
| Ovulation | ~Day 14 | Egg released |
| Luteal | Days 15-28 | Post-ovulation |
Note: Cycle length varies; 21-35 days is considered normal.
Reference Values
| Metric | Normal Range |
|---|---|
| Cycle length | 21-35 days |
| Period length | 2-7 days |
| Flow | Varies; total ~30-40 mL |
Tracking Elements
Menstrual Flow
- Light, medium, heavy, spotting
- Duration of period
- Regularity of cycles
Cervical Mucus
Fertility indicator changing through cycle: - Dry/sticky → Low fertility - Creamy → Medium fertility - Egg white (stretchy, clear) → High fertility
Ovulation Tests
Home LH (luteinizing hormone) tests: - Negative/Positive/High - Surge indicates ovulation ~24-48 hours
Use Cases
- Period prediction - Know when to expect menstruation
- Fertility planning - Identify most fertile days
- Health monitoring - Track irregularities
- PMS awareness - Anticipate symptoms
- Medical history - Share cycle data with providers
When to Discuss with Doctor
- Cycles shorter than 21 or longer than 35 days
- Missing periods (not pregnant)
- Very heavy bleeding
- Severe pain
- Bleeding between periods
- Post-menopausal bleeding
- Sudden changes in pattern
Privacy Note
Cycle tracking data is sensitive. Apple's Cycle Tracking: - Stores data only on your devices - End-to-end encrypted if iCloud backup enabled - Under your control