Fainting or a blackout is a temporary loss of consciousness.

Atrial fibrillation (AF) is a heart condition that causes an irregular and abnormally fast heart rate.

Most chest pain isn’t usually a sign of anything serious, but there are some underlying heart conditions that can cause chest pain.

Supraventricular tachycardia (SVT) is a condition that causes a sudden increase in heart rate, leading to symptoms including palpitations, chest pain and fainting.

Atrial flutter is when your heart's different chambers beat out of rhythm with one another, causing discomfort and pain.

Palpitations make you feel like your heart is beating too hard or fast, skipping a beat, or fluttering.