what could cause a person to pass out

Understanding Fainting -- the Nuts

What Is Fainting?

Fainting, too called syncope (pronounced SIN-ko-pee), is a sudden, brief loss of consciousness and posture caused by decreased blood catamenia to the encephalon.

Many different conditions tin cause fainting. These include heart problems such as irregular center beats, seizures, low blood sugar (hypoglycemia), anemia (a deficiency in salubrious oxygen conveying cells), and problems with how the nervous system (the torso'southward system of nerves) regulates claret force per unit area. Some types of fainting seem to run in families.

While fainting may signal a item medical condition, sometimes information technology may occur in an otherwise healthy private. Fainting is a particular problem for the elderly who may suffer serious injuries from falls when they faint. Most episodes are very brief. In most cases, the private who has fainted regains complete consciousness within just a few minutes.

Fainting is a mutual problem, accounting for 3% of emergency room visits and half dozen% of hospital admissions. Information technology can happen in otherwise healthy people. A person may feel faint and lightheaded (presyncope) or lose consciousness (syncope).

What Causes Fainting?

Fainting may have a variety of causes. A unproblematic episode, also chosen a vasovagal attack or neurally-mediated syncope, is the most mutual type of fainting spell. It is nigh mutual in children and young adults. A vasovagal attack happens because blood pressure level drops, reducing circulation to the brain and causing loss of consciousness. Typically an assault occurs while continuing and is frequently preceded past a sensation of warmth, nausea, lightheadedness and visual "grayout." If the syncope is prolonged, it can trigger a seizure.

You may suffer from a simple fainting spell due to anxiety, fear, pain, intense emotional stress, hunger, or use of alcohol or drugs. Near people who suffer from simple fainting have no underlying heart or neurological (nerve or brain) problem.

Some people have a problem with the way their torso regulates their blood force per unit area, particularly when they motility too chop-chop from a lying or sitting position to a continuing position. This condition is chosen postural hypotension and may exist astringent plenty to crusade fainting. This type of fainting is more common in the elderly, people who recently had a lengthy affliction that kept them in bed and people who have poor muscle tone.

The post-obit can cause fainting, too:

• Diseases of the autonomic nervous system. Your autonomic nervous system is the function of the nervous system that controls involuntary vital functions, such as the chirapsia of your centre, the caste to which your blood vessels are constricted, and animate. Autonomic nervous organization problems include acute or subacute dysautonomia, chronic post-ganglionic autonomic insufficiency, and chronic pre-ganglionic autonomic insufficiency. If you have 1 of these disorders, you are probable to take other symptoms, such as erectile dysfunction (inability to have or maintain an erection), loss of bladder and bowel control, loss of the normal reflexes of your pupils, or decreased sweating, tearing, and salivation.
• Conditions that interfere with the parts of the nervous arrangement that regulate blood pressure and heart charge per unit. These conditions include diabetes, alcoholism, malnutrition, and amyloidosis (in which waxy protein builds upwards in the tissues and organs). If you take certain high blood force per unit area drugs, which deed on your blood vessels, you lot may exist more than probable to suffer from fainting. If yous are dehydrated, which may touch the amount of blood in your body and, thus, your blood pressure, yous may be more likely to faint.
• Heart or claret vessel problems that interfere with blood flow to the brain. These may include centre cake (a problem with the electrical impulses that command your heart muscle), issues with the sinus node (a specialized area of your center that helps it crush), middle arrhythmia (irregular eye rhythm), a blood jell in the lungs, an abnormally narrowed aortic heart valve, or certain other issues with the structure of your eye.
• Conditions that may cause unusual patterns of stimulation to particular nerves. These include micturition syncope (fainting during or afterward urination), glossopharyngeal neuralgia (fainting due to inflammation and pain in a particular nerve to the mouth); cough syncope (fainting after intense coughing), and stretch syncope (fainting that occurs when stretching the neck and artillery).
• Hyperventilation. If you become intensely anxious or panicked and breathe too quickly, you may feel faint from hyperventilation (taking in too much oxygen and getting rid of as well much carbon dioxide too quickly).

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Source: https://www.webmd.com/brain/understanding-fainting-basics

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