There are many reasons why a person may feel light headed. In most cases the reasons are not serious and will only require a few life style changes.
You’re dehydrated – Some people feel lightheaded when they feel hot or have lost fluid. Excess heat can cause a person’s blood pressure to drop, which can cause them to feel faint. The best remedy for this is to stay hydrated throughout the day, by carrying a bottle of water with you at all times.
You’re surprised – You may feel light headed if your family has organized a surprise birthday party or you have received some unexpected good news. Your lightheadedness is mainly due to the effect of the surprise on your nervous system when your nervous system goes into overdrive your blood pressure drops.
You stood up too quickly – If you hop out of bed or from a seated position too quickly, you can feel lightheaded or see black spots. Your lightheadedness is also due to a blood pressure drop, which usually, passes after a few minutes.
You may have an abnormal heart rhythm – If you faint suddenly without little or no warning, you could have an irregular heart rhythm called arrhythmia. Arrhythmia causes the heart to beat too fast or too slow and therefore affects the blood supply to the brain. If you experience these symptoms, it is best to see a doctor immediately.
A problem with a heart valve – Congenital issues which occur in younger people can cause fainting. Heart issues are often due to the heart’s valves not supplying enough blood to the heart.