DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.Nearly every cell in a personâs body has the same DNA.Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).NA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.
1 In particular, blood pressure lowering medications may cause faintness if they lower your blood pressure too much. 2  Anxiety disorders. 3  Certain anxiety disorders may cause lightheadedness or a woozy feeling often referred to as dizziness.
If you have this type of bleeding, you should see a doctor. Untreated heavy or prolonged bleeding can stop you from living your life to the fullest. It also can cause anemia. Anemia is a common blood problem that can leave you feeling tired or weak. Have menstrual periods lasting more than 7 days. 2  Have a menstrual flow with blood clots the size of a quarter or larger. 3  Have a heavy menstrual flow that keeps you from doing the things you would do normally. 4  Have constant pain in the lower part of the stomach during your periods.