Blacking out is not a good sign as it may be due to an underlying condition. Blacking out, fainting or "syncope" in medical terms pertains to the "temporary loss of consciousness that is followed by the return to a full wakefulness". This loss of consciousness can be accompanied with loss of muscle tone which in turn, may result to slumping over of falling.
When a person faints, his or her "reticular activating system" may have lost its blood supply. It may also be deprived of glucose or oxygen. This means, it is only when a person's blood sugar levels are briefly disrupted that he or she may experiences fainting.
Blacking out is not necessarily due to head trauma. When a person loses consciousness following a head injury, it is already considered a "concussion". Then again, there are also cases when fainting can result to injury, particularly if the person falls down and hurts himself.
Blacking Out Causes
There are various reasons why a person faints but one of the most common known reasons is a decreased flow of blood to the brain. This may be due to the following:
. When the heart fails to pump blood;
. When the blood vessels are unable to maintain blood pressure for delivering blood to the brain because they don't have enough "tone";
. When there isn't enough fluid r blood in the blood vessels; or
. Due to a combination of reasons mentioned above.
Signs & Symptoms of Blacking Out
When a person blacks out or faints, he or she is unaware that they did pass out or that they have fallen to the ground. They would only understand later on what has happened. There are signs and symptoms prior to a "blacking out" or "syncopal episode". These are:
. Feeling nauseated, weak, sweaty or lightheaded. Vertigo or dizziness may be felt as well. The person's vision may blur or fade and he or she may hear muffled sounds and feel a tingling sensation in the body.
. For "pre-syncope" or "near-fainting" situations, the person may feel similar symptoms but he or she will not really lose consciousness.
. When the person becomes unconscious, a few twitches of the body may manifest confusing the condition with seizure or epilepsy.
. Upon waking, the person may be confused but this will resolve in a matter of seconds.
. After blacking out or a "syncopal episode", the person will experience a "quick to normal" mental function but there may be other signs and symptoms manifesting depending on the underlying cause or reason for blacking out. One example would be a person suffering from a heart attack where he or she may report chest pain or pressure.
Knowing what causes a person to blackout [http://www.whatcauses.net/what-causes-a-person-to-blackout.html] can help you determine if it is already due to an underlying serious condition like heart attack. The symptoms of heart disease [http://www.mightyguide.net/symptoms-of-heart-disease.html] may not manifest itself right away so if you are caught unaware, it can be life-threatening and fatal.