Category Type Identifiers

All available HealthKit category type identifiers

Overview

Category samples in HealthKit represent data that fits into a predefined set of values. This page lists all 67 available category type identifiers.

Read-Only Categories

These category types are automatically tracked by Apple Watch or iOS and cannot be written by third-party apps.

HKCategoryTypeIdentifierAppleStandHour

Tracks whether the user stood during a particular hour.

Values: CategoryValueAppleStandHour

• stood (0)
• idle (1)

Read-only: Yes

HKCategoryTypeIdentifierHighHeartRateEvent

Records events when the user’s heart rate exceeds a specified threshold.

Values: CategoryValueNotApplicable.notApplicable

Read-only: Yes

HKCategoryTypeIdentifierLowHeartRateEvent

Records events when the user’s heart rate falls below a specified threshold.

Values: CategoryValueNotApplicable.notApplicable

Read-only: Yes

HKCategoryTypeIdentifierHeadphoneAudioExposureEvent

Tracks when headphone audio exposure exceeds safe listening levels.

Values: CategoryValueNotApplicable.notApplicable

Read-only: Yes

Sleep & Activity

HKCategoryTypeIdentifierSleepAnalysis

Represents sleep stages and in-bed time.

Values: CategoryValueSleepAnalysis

• inBed (0)
• asleepUnspecified (1)
• awake (2)
• asleepCore (3)
• asleepDeep (4)
• asleepREM (5)

Writeable: Yes

HKCategoryTypeIdentifierSleepApneaEvent

Records sleep apnea events.

Values: number

Writeable: Yes

Available: iOS 18+

HKCategoryTypeIdentifierMindfulSession

Tracks mindfulness or meditation sessions.

Values: CategoryValueNotApplicable.notApplicable

Writeable: Yes

HKCategoryTypeIdentifierToothbrushingEvent

Records toothbrushing events.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierHandwashingEvent

Tracks handwashing events.

Values: number

Writeable: Yes

Reproductive Health

HKCategoryTypeIdentifierCervicalMucusQuality

Tracks cervical mucus quality.

Values: CategoryValueCervicalMucusQuality

• dry (1)
• sticky (2)
• creamy (3)
• watery (4)
• eggWhite (5)

Writeable: Yes

HKCategoryTypeIdentifierOvulationTestResult

Records ovulation test results.

Values: CategoryValueOvulationTestResult

• negative (1)
• luteinizingHormoneSurge (2)
• indeterminate (3)
• estrogenSurge (4)

Writeable: Yes

HKCategoryTypeIdentifierMenstrualFlow

Tracks menstrual flow.

Values: CategoryValueMenstrualFlow

• unspecified (1)
• none (5)
• light (2)
• medium (3)
• heavy (4)

Writeable: Yes

Deprecated: In iOS 18 beta

Metadata: Supports HKMenstrualCycleStart boolean

HKCategoryTypeIdentifierIntermenstrualBleeding

Records spotting or bleeding between periods.

Values: CategoryValueNotApplicable.notApplicable

Writeable: Yes

HKCategoryTypeIdentifierInfrequentMenstrualCycles

Tracks infrequent menstrual cycles.

Values: number

Writeable: Yes

Available: iOS 16+

HKCategoryTypeIdentifierIrregularMenstrualCycles

Records irregular menstrual cycles.

Values: number

Writeable: Yes

Available: iOS 16+

HKCategoryTypeIdentifierPersistentIntermenstrualBleeding

Tracks persistent intermenstrual bleeding.

Values: number

Writeable: Yes

Available: iOS 16+

HKCategoryTypeIdentifierProlongedMenstrualPeriods

Records prolonged menstrual periods.

Values: number

Writeable: Yes

Available: iOS 16+

HKCategoryTypeIdentifierSexualActivity

Tracks sexual activity.

Values: CategoryValueNotApplicable.notApplicable

Writeable: Yes

Metadata: Supports HKSexualActivityProtectionUsed boolean

HKCategoryTypeIdentifierContraceptive

Records contraceptive use.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierLactation

Tracks lactation periods.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierPregnancy

Records pregnancy.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierPregnancyTestResult

Records pregnancy test results.

Values: CategoryValuePregnancyTestResult

• positive (2)
• negative (1)
• indeterminate (3)

Writeable: Yes

HKCategoryTypeIdentifierProgesteroneTestResult

Records progesterone test results.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierBleedingAfterPregnancy

Tracks bleeding after pregnancy.

Values: number

Writeable: Yes

Available: iOS 18+

HKCategoryTypeIdentifierBleedingDuringPregnancy

Records bleeding during pregnancy.

Values: number

Writeable: Yes

Available: iOS 18+

Heart Health

HKCategoryTypeIdentifierIrregularHeartRhythmEvent

Records irregular heart rhythm events.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierLowCardioFitnessEvent

Tracks low cardio fitness events.

Values: CategoryValueLowCardioFitnessEvent

• lowFitness (1)

Writeable: Yes

Environmental & Safety

HKCategoryTypeIdentifierAudioExposureEvent

Records audio exposure events.

Values: number

Writeable: Yes

Deprecated: Use HKCategoryTypeIdentifierEnvironmentalAudioExposureEvent instead

HKCategoryTypeIdentifierEnvironmentalAudioExposureEvent

Tracks environmental audio exposure events.

Values: number

Writeable: Yes

HKCategoryTypeIdentifierAppleWalkingSteadinessEvent

Records walking steadiness events.

Values: number

Writeable: Yes

Symptoms

All symptom identifiers use severity-based values unless otherwise noted.

Digestive Symptoms

HKCategoryTypeIdentifierAbdominalCramps

Values: CategoryValueSeverity (notPresent, mild, moderate, severe, unspecified)

HKCategoryTypeIdentifierAppetiteChanges

Values: CategoryValueAppetiteChanges

• decreased (2)
• increased (3)
• noChange (1)
• unspecified (0)

HKCategoryTypeIdentifierBloating

Values: CategoryValueSeverity

HKCategoryTypeIdentifierConstipation

Values: CategoryValueSeverity

HKCategoryTypeIdentifierDiarrhea

Values: CategoryValueSeverity

HKCategoryTypeIdentifierHeartburn

Values: CategoryValueSeverity

HKCategoryTypeIdentifierNausea

Values: CategoryValueSeverity

HKCategoryTypeIdentifierVomiting

Values: CategoryValueSeverity

Respiratory Symptoms

HKCategoryTypeIdentifierChestTightnessOrPain

Values: CategoryValueSeverity

HKCategoryTypeIdentifierCoughing

Values: CategoryValueSeverity

HKCategoryTypeIdentifierRunnyNose

Values: CategoryValueSeverity

HKCategoryTypeIdentifierShortnessOfBreath

Values: CategoryValueSeverity

HKCategoryTypeIdentifierSinusCongestion

Values: CategoryValueSeverity

HKCategoryTypeIdentifierSoreThroat

Values: CategoryValueSeverity

HKCategoryTypeIdentifierWheezing

Values: CategoryValueSeverity

Cardiovascular Symptoms

HKCategoryTypeIdentifierRapidPoundingOrFlutteringHeartbeat

Values: CategoryValueSeverity

HKCategoryTypeIdentifierSkippedHeartbeat

Values: CategoryValueSeverity

Pain Symptoms

HKCategoryTypeIdentifierBreastPain

Values: CategoryValueSeverity

HKCategoryTypeIdentifierGeneralizedBodyAche

Values: CategoryValueSeverity

HKCategoryTypeIdentifierHeadache

Values: CategoryValueSeverity

HKCategoryTypeIdentifierLowerBackPain

Values: CategoryValueSeverity

HKCategoryTypeIdentifierPelvicPain

Values: CategoryValueSeverity

Neurological Symptoms

HKCategoryTypeIdentifierDizziness

Values: CategoryValueSeverity

HKCategoryTypeIdentifierFainting

Values: CategoryValueSeverity

HKCategoryTypeIdentifierMemoryLapse

Values: CategoryValueSeverity

General Symptoms

HKCategoryTypeIdentifierAcne

Values: CategoryValueSeverity

HKCategoryTypeIdentifierBladderIncontinence

Values: CategoryValueSeverity

HKCategoryTypeIdentifierChills

Values: CategoryValueSeverity

HKCategoryTypeIdentifierDrySkin

Values: CategoryValueSeverity

HKCategoryTypeIdentifierFatigue

Values: CategoryValueSeverity

HKCategoryTypeIdentifierFever

Values: CategoryValueSeverity

HKCategoryTypeIdentifierHairLoss

Values: CategoryValueSeverity

HKCategoryTypeIdentifierHotFlashes

Values: CategoryValueSeverity

HKCategoryTypeIdentifierLossOfSmell

Values: CategoryValueSeverity

HKCategoryTypeIdentifierLossOfTaste

Values: CategoryValueSeverity

HKCategoryTypeIdentifierMoodChanges

Values: CategoryValueSeverity

HKCategoryTypeIdentifierNightSweats

Values: CategoryValueSeverity

HKCategoryTypeIdentifierSleepChanges

Values: CategoryValueAppetiteChanges (same enum, different context)

HKCategoryTypeIdentifierVaginalDryness

Values: CategoryValueSeverity

Type Reference

CategoryValueSeverity

enum CategoryValueSeverity {
  notPresent = 1,
  mild = 2,
  moderate = 3,
  severe = 4,
  unspecified = 0,
}

CategoryValuePresence

enum CategoryValuePresence {
  notPresent = 1,
  present = 0,
}

CategoryValueNotApplicable

enum CategoryValueNotApplicable {
  notApplicable = 0,
}

See the Apple HealthKit Documentation for detailed information about each category type.