I feel faint when I stand for more than five minutes. What is the issue?

Other conditions
1

i have this fatigue and light-headedness whenever I stand for more that five minutes. Sometimes it comes with a back ache, sometimes it doesn’t. These fatigue spells last for more than ten minutes when they come, and I have no idea what the problem is.

It has been happening for a very long time now, since I was a teenager. I thought it was normal, but now i’m beginning to get worried as this affects my workflow

2

You need to check your blood pressure sitting down and then check again when you stand up. You may have a drop in pressure as you stand up. If this happens a lot you should see your doctor.