what would be the general reason for lower blood pressure when lying down?
415014
Your entire body is pretty much on a level with your heart when you're lying down. When you stand up, your head, shoulders and upper chest are higher than your heart. Standing up, your heart has to pump harder to push the blood up to your head (and your brain in particular has a good blood supply). The heart pumping harder means the blood pressure is raised.
225438
It is caused by a vasovagal reaction where your heart beat slows down and your blood pressure drops causing less blood flow to the brain. Happens to me with needles and its kind of embarrassing.
441647
It could be a cause of low blood pressure so try getting some sleep and rest. Eat properly. Have a right diet, because there are many causes of dizziness. Hope that helps. :)
977329
Gravity!  the heart works harder to pump blood when you are standing!
838817
Generally common in young people , but low blood pressure is vague term, importantly if your blood pressure is generally low and you are asymptomatic, that means its not causing you any problems, only thing your doctor can advise is to increase caffeine/salt intake, But low blood pressure which has come on suddenly and causing you dizziness and fainting needs to be investigated by your doctor. In nutshell, if you have low blood pressure and no symptoms, consider yourself lucky and maintain healthy lifestyle, if on other hand, its come on recently and its giving you problems, you need to see doctor
6331
In certain conditions yes this is normal.  The big question is "How do you (the patient) feel?"  Some people need a low BP and some people have a heart so poor that it is unable to produce a high BP.  When the BP decreases the heart rate may elevate as a compensatory mechanism to help supply the body with blood. In this circumstance low BP high HR is entirely normal. However, if your BP is so low that you are getting dizzy , feel terrible, tired lethargic you may need further medical advice
221407
Alternative names    \n\nPassed out; Lightheadedness - fainting; Syncope; Vasovagal \nDefinition    Return to top \n\nFainting is a temporary loss of consciousness due to a drop in blood flow to the brain. The episode is brief (lasting less than a couple of minutes) and is followed by rapid and complete recovery. You may feel lightheaded or dizzy before fainting.\n\nA longer, deeper state of unconsciousness is often called a coma.\n\nConsiderations    Return to top \n\nWhen you faint, you not only experience loss of consciousness, but also loss of muscle tone and paling of color in your face. You may also feel weak or nauseated just prior to fainting, and you may have the sense that surrounding noises are fading into the background.\n\nCommon Causes    Return to top \n\nFainting may occur while you are urinating, having a bowel movement (especially if straining), coughing strenuously, or when you have been standing in one place too long. Fainting can also be related to fear, severe pain, or emotional distress.\n\nA sudden drop in blood pressure can cause you to faint. This may happen if you are bleeding or severely dehydrated. It can also happen if you stand up very suddenly from a lying position.\n\nCertain medications may lead to fainting by causing a drop in your blood pressure or for another reason. Common drugs that contribute to fainting include those used for anxiety, high blood pressure, nasal congestion, and allergies.\n\nOther reasons you may faint include hyperventilation, use of alcohol or drugs, or low blood sugar.\n\nLess common but more serious reasons include heart disease (like abnormal heart rhythm or heart attack) and stroke.\n\nHome Care    Return to top \n\nIf you have a history of fainting and have been evaluated medically, follow your doctor's instructions for how to prevent fainting episodes. For example, if you know the situations that cause you to faint, avoid or change them. Avoid sudden changes in posture. Get up from a lying or seated position slowly and gradually. When having blood drawn (if this makes you faint), tell the technician and make sure that you are lying down.\n\nImmediate treatment for someone who has fainted includes:\n\nChecking the person's airway and breathing. If necessary, call 911 and begin rescue breathing and CPR. \nLoosening tight clothing around the neck. \nKeeping the affected person lying down for at least 10 - 15 minutes, preferably in a cool and quiet space. If the person cannot lie down, have him sit forward and lower his head below the levels of the shoulders, between the knees. \nIf vomiting has occured, turning the person onto one side to prevent choking \nElevating the feet above the level of the heart (about 12 inches). \nCall your health care provider if    Return to top \n\nCall 911 if the person who fainted:\n\nFell from a height, especially if injured or bleeding. \nDoes not regain consciousness quickly (within a couple of minutes). \nIs pregnant or over 50 years old. \nHas diabetes (check medical identification bracelets). \nFeels chest pain, pressure, or discomfort; pounding or irregular heartbeat; or has loss of speech, visual disturbances, or inability to move one or more limbs. \nHas convulsions, tongue trauma, or loss of bowel control. \nEven if it's not an emergency situation, people should be evaluated by a doctor if they have never fainted before, if they are fainting frequently, or if they have new symptoms associated with fainting. Call for an appointment to be seen as soon as possible.\n\nWhat to expect at your health care provider's office    Return to top \n\nWhen you see your doctor, the focus of the questions will be to determine whether you simply fainted, or if something else happened (like a seizure), and to figure out the cause of the fainting episode.\n\nThe questions will include:\n\nHow would you describe the dizziness that you felt before fainting? Did you feel light-headed, off-balance, or like the room was spinning? \n
9499
People that faint in the face of danger, are suffering from a suddenly and significant drop in blood pressure.\n\nFainting is actually a valuable self protective response.When blood pressure drops this way, there is a chance the brain won't get enough blood, because it's at the highest point of the body. That's no good - your brain needs a steady supply of the oxygen the blood carries. So when your body can't get enough blood to your brain because of low blood pressure, it protects you by bringing your brain down to the blood. In other words, the purpose of a faint is to ensure a blood supply to the brain by bringing your head down to the ground, so your heart doesn't have to overcome gravity.
641619
The top number (systolic) is the maximum pressure in the artery (when the heart beats). The bottom number (diastolic) is the lowest pressure in the artery (when the heart is at rest). "Too low" is determined by if it affects the person. Low blood pressure can mean dizziness or fainting. If that's not a problem, then it's not too low. The main problem with blood pressure is when it gets too high, because then it affects the arteries, which can lead to other problems. As long as he's feeling well, that's excellent blood pressure for someone his age.
1056387
possibly circulation shutting down? lack of oxygen, lack of blood pressure? Depends what has failed.
856840
There are several pressure points in the body, such as the tailbone, the shoulder blades, the back of the head and ears.. etc.  When a person lays in one position for a long period of time, pressure is placed on those points, which decreases the blood flow to that area.  Less blood flow creates weaker tissue.  The weaker the tissue, the more likely it will become sore and open creating a bed sore.  By rotating patients every one to two hours, it lessens the pressure to different pressure points, thus decreasing the probability of the skin breaking down.  \nWe also use air mattresses that alternate pressure  at the hospital I work at.  They work wonderful for preventing sores, and also for helping to heal the sores that a patient may already have.
232770
A person whose BP is 56/33 is very hypotensive (low blood pressure).  Yes, it can be a precursor to death if not treated.  It is a result of many conditions, some of which are:  hypovolemia (low blood volume due to blood loss from injury), shock from a systemic infection, allergic reaction, cardiogenic shock, dehydration, etc. \n\nA person whose BP is this low, if conscious, may experience these symptoms:  fatigue, weakness, dizziness, nausea, vomiting, altered mental status, cardiac arrhythmia and more.
532881
I think it's like blood pressure limitations.  They do it until you pass out, and they go one less.
104647
I could be low blood pressure.  It could also be that when you stand up quickly, your circulation changes.  When you're sitting, you have a lower heart rate... the act of standing up (and doing it quickly) changes that resting circulation.  \n\nGood God, I hope this helps because I think I just confused myself.  ;)
493399
You need to check your blood pressure. Low blood pressure may cause dizziness when you sit suddenly after waking up. Buy sea salt and use it (just keep under tongue) more often during the day. That should help a lot.
735962
It happens when you press the blood vessels and the blood supply is cut off momentarily. Better keep your hands free and do not put pressure on them by putting it under your head or keeping them hard pressed between your thights etc. More suggestions only if you can tell which way you sleep. \n\nIf it persists, consult a physician
782442
could be several things\n\nhigh blood pressure-when your blood pressure gets to high-your body's autoimmune response is to try and shut itself down for protection. this means causing severe dizziness,faintness,complete loss of consciousness, chest pain,numbness,and blurry vision\n\nlow blood sugar-when the body's blood sugar gets too low-one can have feelings of extreme weakness or fatigue,dizziness,passing out,breaking out into sweats,confusion or disorientation.\n\npanic/anxiety attack. symptoms of these are:\n\n-overwhelming feeling of panic ( like you are going to die)\n-chest pain/tightness\n-dizziness or faintness\n-confusion or disorientation\n-blurry vision\n-heart palpitations\n\nany one of these situations can require immediate medical attention. but first try these things\n\n-lie down in a dark,quiet,and comfortable room\n-place a cold washcloth on your forehead\n-take slow,deep breaths and try to focus on relaxing\n-have someone get you something cold to drink or get it yourself before lying down. take small,frequent sips\n\nrest for about 20-30 mins. if you are still having the same symptoms have someone take you to the emergency room. if there is nobody available to drive you-call 911 and have an ambulance come get you. since you are having vision problems-it is not safe for you to drive.