Presyncope is a condition characterized by a feeling of lightheadedness or dizziness that often occurs just before fainting. It can happen when the brain doesn't receive enough blood flow, which may be caused by various factors such as dehydration, low blood pressure, or standing up too quickly. People experiencing presyncope might feel weak, sweaty, or have blurred vision. This sensation is usually temporary and resolves quickly, but it can be alarming. It's important to identify the underlying causes, which may involve lifestyle changes or medical evaluation. If someone frequently experiences presyncope, they should consult a healthcare professional for proper assessment and guidance.