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.
The National Osteoporosis Foundation estimates that 10 million people in the U.S. have osteoporosis and nearly 34 million more have osteopenia, which puts them at greater risk for osteoporosis. Bone mineral density (BMD) is related to bone strength.BMD testing is used to diagnose osteoporosis. BMD is measured with a test called a DXA scan. By measuring BMD, doctors can predict the risk of having a bone fracture. Normal: Bones have a density that is healthy. 2  Low bone mass (medically termed osteopenia): Bones show the beginning of bone loss, but not enough to be osteoporosis. 3  Osteoporosis: Bones are weak and porous, and more likely to break.