Heart & Circulation · PerceptionSeeing black on standing up
Brief spots of light or darkening of vision can occur when standing up quickly.
Frequency: Varies by individualHeart & Circulation
Heart & Circulation · Perception
Heart & Circulation · Involuntary responseRespiratory sinus arrhythmia
The pulse becomes slightly faster when inhaling and slower when exhaling.
Frequency: Common
Heart & Circulation · PerceptionPalpitations
The heartbeat may be perceived as pounding, fluttering, or skipped beats.
Frequency: Varies by individual
Heart & Circulation · Involuntary responseVasovagal reaction
Pain, seeing blood, or prolonged standing can trigger nausea, warmth, and near-fainting.
Frequency: Varies by individualSurprisingly quiet here.
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