Nausea refers to a feeling of queasiness and vertigo or the feeling that a person has before vomiting.
A "shock to the system" that impacts the part of nervous system that affects heart rate and blood pressure can cause vasovagal syncope. Carbon monoxide poisoning is the most common form of accidental poisoning that leads to death in the United States. In addition to nausea and fainting, symptoms of vasovagal syncope include cold sweat, clammy sweat, and paleness.
Ultimately, this decreases the amount of blood flowing to the brain, which leads to a short period of unconsciousness until the body readjusts. If the fainting spell is the first incident, the victim should make an appointment to see a physician to make sure that the vasovagal syncope incident was not related to an underlying medical condition. Detecting carbon monoxide, a gas, is difficult as carbon monoxide lacks a taste, a color, or a smell.

In addition to nausea and fainting, a person who is experiencing carbon monoxide poisoning may be confused, may vomit, or may experience chest pains.
In a hospital situation, pure oxygen may be supplied to the patient via a mask over the nose and mouth.
Among the conditions that cause nausea and fainting are vasovagal syncope and carbon monoxide poisoning. Shocks that can lead to vasovagal syncope can include emotional reactions to the sight of blood or injuries, physical factors like standing with locked legs for too long, and environmental causes such as standing in a hot, crowded room with little ventilation for an extended period of time.
Methods of preventing carbon monoxide poisoning include installing carbon monoxide detectors, maintaining and using gas appliances as directed by the appliances' manufacturers, and always opening the garage door before starting a vehicle. People who are drunk or asleep may succumb to carbon monoxide poisoning without experiencing any of the symptoms related to the poisoning. Some cases require treatments in a hyperbaric chamber, where the whole body is supplied oxygen under pressurized conditions.

In addition, medical conditions including heart disorders, low blood sugar, also called hypoglycemia, or dehydration can lead to vasovagal syncope. In addition, people should only purchase gas appliances that have been approved by organizations such as American Gas Association or Underwriters' Laboratories. In addition, people who have already lost consciousness may remain unconscious until they die. She had to go to the hospital for fluids and IV nourishment since she couldn't keep anything down.

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