Distinguishing hot flashes and night sweats: a mixed-method analysis

Area of Science:

• Reproductive Endocrinology
• Sleep Medicine
• Psychosomatic Medicine

Background:

• Hot flashes (HF) and night sweats (NS) are common vasomotor symptoms (VMS) during menopause.
• Differentiating HF and NS is crucial for understanding their distinct physiological and psychological impacts.
• Current research often groups HF and NS together, potentially obscuring unique symptom characteristics.

Purpose of the Study:

• To investigate whether participants perceive night sweats (NS) and hot flashes (HF) as distinct vasomotor symptoms (VMS).
• To compare subjective reports of NS with objective physiological measurements.
• To examine the differential associations of HF and NS with stress, depression, and sleep quality.

Main Methods:

• Utilized data from 274 participants (ages 45-55) including physiological monitoring (skin conductance, activity) and self-reported questionnaires.
• Employed thematic analysis for qualitative data on HF and NS experiences.
• Used logistic regression to compare subjective and objective VMS with stress, depression, and sleep variables.

Main Results:

• Qualitative analysis revealed participants distinguish NS as prolonged, full-body sweating, differing from HF's typical heat and anxiety.
• Objective measurements showed NS were significantly longer (mean 60.5 min) than HF (mean 3.4 min) and occurred earlier in the night.
• Subjective VMS, but not objective measures, were significantly associated with increased stress, depression, and poorer sleep quality.

Conclusions:

• Night sweats (NS) and hot flashes (HF) represent distinct phenomena, not merely variations of the same symptom.
• The findings support the need for separate diagnostic criteria for NS in clinical and research settings.
• Night sweats may possess unique health implications warranting further investigation.