Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
When older people fall or pass out, something upstream is broken—find it and fix it before the next fall breaks a bone or the next faint stops the heart for good.
Three security guards protecting the brain's blood supply
Imagine your brain is a VIP in a building, and three security teams must keep it safe. Team 1 (the heart) is the elevator operator—it must deliver exactly five liters of visitors per minute or the VIP starves. Team 2 (the autonomic nervous system) is the doorman—when visitors start to pool in the lobby downstairs (blood pooling in legs when you stand), the doorman instantly squeezes the hallways and speeds up the elevator to push flow upward and keep the VIP's office pressurized. Team 3 (balance and vestibular system) is the building's gyroscope and camera system—it watches where the VIP is tilting and fires corrector cables to keep the whole structure level. When Team 1 fails (the elevator stalls or races out of control), the VIP passes out from starvation. When Team 2 fails (the doorman is slow or broken, so hallways stay floppy when you stand), blood pools downstairs, pressure drops upstairs, the VIP faints. When Team 3 fails (cameras send wrong signals or cables are weak), the VIP loses balance and falls even though they're conscious. Most often, two or three teams are limping, and one new stress (a big visitor, a jammed hallway, a weak cable) tips the system into crisis.
ACC/AHA/HRS 2017 Syncope Guideline · American Geriatrics Society 2022 Falls Prevention Guideline · Cochrane Systematic Reviews (Syncope and Falls) · NEJM Clinical Practice (Syncope in Adults) · reviewed 2026-07-07