A fast heartbeat (also called palpitations or tachycardia) is the sensation that your heart is beating faster, harder, or irregularly. Episodes can be brief and harmless, or they can reflect an underlying issue that needs medical review. This page summarizes how it may feel, common triggers, warning signs that require urgent attention, and which specialists may be involved in evaluation.
People commonly describe palpitations as pounding, fluttering, a racing sensation, or a skipped beat. Some experience lightheadedness, shortness of breath, sweating, or chest discomfort. Episodes differ in duration and pattern — from a single short spell to frequent or sustained episodes — and that pattern helps clinicians decide next steps.
Causes range from heart-related issues such as arrhythmias or structural heart problems to non-cardiac triggers. Frequent non-cardiac factors include stress or anxiety, physical exertion, caffeine or alcohol, fever, hormonal changes (for example thyroid function), and imbalances such as electrolyte or respiratory problems. Certain medications and substances can also speed the heart; discuss any concerns about medicines with a health professional.
Seek immediate medical help if a fast heartbeat occurs with severe chest pain, fainting or near-fainting, sudden severe breathlessness, heavy sweating, or confusion — these can signal a serious problem. Even if symptoms are less severe, recurrent, worsening, or cause major concern, arrange timely medical assessment rather than waiting.
Initial assessment is often by a primary care physician or internal medicine doctor; cardiology referral is common if heart-related causes are suspected. Evaluation may include history and physical exam, a resting ECG, and ambulatory rhythm monitoring (Holter or event recorder) to catch episodes. Blood tests (for thyroid function, electrolytes) and imaging may be used when indicated. The goal is to rule out urgent causes and identify the appropriate specialty for further care.
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