Photo Credit George Doyle/Stockbyte/Getty Images. If a person experiences a drop in blood pressure, fever, diarrhea, loss of hydration from vomiting or dizziness, lightheadedness can occur. Further, if the brain does not receive enough blood, it can cause lightheadedness as well.eart Attack. Heart attack is one of the more serious conditions that cause lightheadedness. During a heart attack, oxygen is prevented from getting to the heart and the rest of the body when blood vessels are blocked, causing the head to feel light and weightless.
Screening for Osteoporosis. 1  An easy and painless procedure, an osteoporosis screening requires you to place your foot in an ultrasound device called a bone densitometer. 2  This device then measures the bone mineral density of your heel.steoporosis Screening/Bone Density Test. Osteoporosis is a disease in which bone becomes extremely fragile. Bone is a complex living tissue that can be weakened by poor diet and lack of exercise.
A bone density test tells you if you have normal bone density, low bone density (osteopenia) or osteoporosis. It is the only test that can diagnose osteoporosis. The lower your bone density, the greater your risk of breaking a bone. A bone density test can help you and your healthcare provider: