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Dizziness and fast heart rate when standing up after prolonged sitting or lying is called postural hypotension. The medical term used for this condition is Orthostatic hypotension.

The dizziness and the fast heart rate are due to abnormal sudden drop in your blood pressure when you stand up.

Postural hypotension is usually mild and last only for a very short period, a few seconds to a few minutes. When postural hypotension turns into long-lasting condition this may be a sign of a serious problem, so we recommend that you talk to your physician if you frequently feel dizzy when standing up. It's more necessary to see a doctor if you lose consciousness.
Mild postural hypotension usually doesn't need any treatment. Many people feel lightheaded after standing, and it's often not cause for concern. More severe cases are treated depending on the cause.

Symptoms of postural hypotension include:

o Dizziness and lightheadedness after standing up
o Momentary darkening in front of your eyes and blurry vision
o Loss of consciousness
o Nausea
o Sometimes even confusion

Postural hypotension is caused by something that interrupts the body's ability of counteracting dropping in blood pressure. This interruption can be caused by many different conditions, including:

o Dehydration. This is the most common cause especially in young healthy adults suffering from postural hypotension. Dehydration itself can be caused by fever, diarrhea, vomiting, not drinking enough fluids, and exercise with excessive loss of water through sweating. As a result of losing water the volume of blood in your body decreases.
o Heart problems. The most common heart conditions that may cause postural hypotension are heart valve problems, heart failure, and heart attack. These conditions may cause less blood to be pumped to the brain by preventing your body from being responding rapidly when more blood is needed, as when stand up.
o Nervous system disorders. Such as Parkinson's disease or multiple system atrophy can affect your body's ability to regulate blood pressure.
o Diabetes. Can cause dehydration especially when it is undertreated by causing frequent urination. Also, diabetes can damage the nerves that control the blood pressure.
o Medications. Certain medications can cause this condition, such as blood pressure medication, especially water pills. Also, heart medications, especially beta blockers. If you are taking any medication please check the side effects looking for postural hypotension.
o Pregnancy. During pregnancy mother's blood has to go through additional circulatory system that's why blood pressure is likely to drop. In addition, enlarged uterus with the baby inside it, can press on the veins in the pelvis causing more blood to accumulate in the legs and less blood to reach the brain.

The treatment for postural hypotension depends on the underling condition.

Keep the volume of your blood high, don't forget to drink water, especially during exercise; avoid walking for a long distance in hot weather; stand up slowly, these are all things you can do.

Another treatment strategy is to exercise your calf muscles because this muscles prevent the blood from accumulating in your legs.

If you are healthy young person with no other medical issues, especially with no high blood pressure, you can increase the salt in your diet.

If this lifestyle changes do not help your doctor may prescribe some medication to treat this condition.

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