How do you know if your heart flutters?

Diagnosing palpitations

A fluttering sensation in your chest is a specific type of heart palpitation that may indicate an atrial flutter . This condition is the result of an arrhythmia that causes tachycardia, which is a fast heartbeat (more than 100 beats a minute).

You might feel heart palpitations in your throat or neck as well as your chest. They can occur when you’re active or at rest.