A person who briefly feels lightheaded after standing up may have a relatively simple explanation.
Actually losing consciousness is different.
If someone suddenly collapses or becomes unresponsive, the situation should be treated seriously.
If the person is not breathing normally or cannot be awakened, emergency medical assistance is required immediately.
7. Nausea, Sweating, or Unusual Discomfort
Some heart problems can produce symptoms that people mistakenly blame on the stomach.
These can include:
Nausea
Vomiting
Indigestion-like discomfort
Unusual sweating
Weakness
Lightheadedness
This can be particularly confusing because nausea and stomach discomfort are extremely common and usually have non-cardiac causes.
But when
Possible triggers include:
Stress
Anxiety
Caffeine
Nicotine
Alcohol
Dehydration
Fever
Certain medications
Hormonal changes
Electrolyte abnormalities
Abnormal heart rhythms
Some heart rhythm disorders can require medical evaluation and treatment.
When Palpitations Are More Concerning
Palpitations deserve urgent attention when they occur together with:
Chest pain
Severe shortness of breath
Fainting
Severe dizziness
Confusion
Extreme weakness
A rapid or irregular heartbeat combined with these symptoms can be more concerning than an isolated brief palpitation.
6. Dizziness, Lightheadedness, or Fainting
