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Tachycardia is a medical term referring to a heart rate that exceeds the normal resting rate. In adults, a resting heart rate of over 100 beats per minute is generally considered tachycardia. This condition can affect individuals of all ages, including infants and children, though the specific rate considered tachycardic varies with age.

The causes of tachycardia are diverse and can range from physiological responses to underlying medical conditions. Common triggers include exercise, stress, anxiety, fever, and certain medications. More serious causes can include dehydration, electrolyte imbalances, hyperthyroidism, anemia, heart disease such as arrhythmias, and lung conditions. In some cases, the exact cause of tachycardia may not be immediately apparent and requires further investigation.

Symptoms associated with tachycardia can vary widely. Some individuals may experience no noticeable symptoms, while others might feel palpitations, a racing or pounding heart sensation, shortness of breath, dizziness, chest pain, or even fainting. The presence and severity of symptoms often depend on the underlying cause and the duration of the elevated heart rate.

Diagnosis typically involves a medical history, physical examination, and an electrocardiogram (ECG or EKG) to assess the heart's electrical activity. Further tests, such as Holter monitoring, echocardiograms, or blood tests, may be conducted to identify the specific type of tachycardia and its cause. Treatment for tachycardia is tailored to the individual's situation and aims to address the underlying issue and control the heart rate. This can involve lifestyle modifications, medications, or in some instances, medical procedures.