Getting a head rush is no fun. That lightheaded feeling you get from sitting or lying down can really leave you in a tizzy.In medical terms, it is known as orthostatic hypotension. While it is normal to experience a head rush, it could be a sign of an underlying problem. Here are a few unusual reasons you get a head rush.

While hot showers can help you wind down, it could also cause you to experience a head rush. Too much of that heat may cause your blood pressure levels to drop. The sudden movement of your body may be the reason for your head rush. You don't have to stop taking your hot showers, just be mindful how long you're in there for.

If you are not drinking a sufficient amount of water, you may be dehydrated. This is what is causing you to get a head rush. "Typical causes of a head rush feeling include anything that can dramatically change your blood volume and blood pressure," Sherry Ross, M.D., ob-gyn and women's health expert at Providence Saint John's Health Center in Santa Monica, told a news portal. Dehydration can decrease the volume of blood circulation flowing through your vessels. That is why you experience that rush when you stand.

According to the Mayo Clinic, standing for too long can cause your blood pressure levels to drop. It is one of the reasons you may be getting a head rush. What you need to do is get the blood moving again. Start to move your legs and stretch your body out a bit.

It is normal for women to feel dizzy in their first trimester. This is because of the increased blood supply and change in the circulatory system.Ob-gyn Shawn Tassone, told a news portal "this blood makes a pit stop at the uterus and your growing fetus, causing your brain to experience a few seconds with decreased oxygen". It is best to seek professional advice if you think this is your experience.