Chills

Chills in Apple Health records a reported symptom, with a severity label. It does not measure shivering frequency, room temperature or body temperature.

Apple uses HKCategoryValueSeverity for this type. Unspecified is not the same as notPresent, and a missing record is neither. The integers identify labels; numerical averages and physiological reference ranges do not apply.

Chills and Fever are separate symptom categories. A chills entry does not automatically create a fever entry or a thermometer reading. Body Temperature stores a separate numerical measurement. Keep these histories distinct even when they occur on the same day.

A useful note can distinguish feeling cold from noticeable shaking and include any measured temperature. The category label alone does not contain those details or identify a cause.

Keep symptom observations separate from ordinary changes in ambient temperature. Report which days were logged and which were not, rather than treating a gap as recovery. Repeated records may describe follow-up observations of one experience; their count is not automatically a count of separate episodes.

This is a logged symptom, with no fixed sensor sampling schedule. Start-to-start gaps describe when observations were saved. A sample’s start and end times describe the interval supplied by its source; their difference does not establish the full duration of a clinical episode. Repeated or overlapping records need review before counting episodes.

This category is not currently listed in the PulsHealth sync catalog. No observations were present in the reviewed user data, so recorded severity frequencies, source differences and logging intervals could not be measured. That database coverage does not establish whether entries exist in Apple Health.