Tachycardia generally has no relation to obesity. Clinically, tachycardia can be categorized into sinus tachycardia, paroxysmal supraventricular tachycardia, ventricular tachycardia, and other types, none of which have a definitive relation to obesity. There are many causes of tachycardia, such as fever, hyperthyroidism, and anemia. Additionally, certain structural heart diseases and pulmonary diseases can also lead to tachycardia. While obesity itself introduces a range of issues like hyperlipidemia, diabetes, and other metabolic abnormalities, which might affect the heart rate, this impact is usually not severe.