
Ten Triggers Behind Faintness and Lightheadedness, Explained
Doctors outline 10 common causes of fainting or lightheadedness—dehydration (often from heat or illness), surprise triggers, standing up quickly (orthostatic hypotension), abnormal heart rhythms, heart valve problems, medication side effects, low blood sugar, flu-related dehydration or reduced intake, stroke, and Postural Orthostatic Tachycardia Syndrome (POTS)—and offer practical tips to stay hydrated and nourished, plus guidance on when to seek medical or urgent care.











