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Anxiety is a feeling of unease, such as worry or fear, that can be mild or severe.
Our Health A-Z contains more information on Anxiety.
Supraventricular tachycardia (SVT) is the name given to an abnormality of heart rhythm, characterised by a fast heartbeat.
Our Health A-Z contains more information on SVT.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.