Common causes of tachycardia include:

• Fever
• Anxiety or fear:
• Panic attacks
• Dehydration
• Heart disease
• Lung disease
• Alcohol use
• Caffeine overdose
• Cocaine abuse
• Smoking
• Anemia
• Hyperthyroidism
• Drug abuse
• Drug side effect:
• Digoxin (Lanoxin)
• Nonprescription asthma inhalers
• Albuterol Inhaler
• Proventil Inhaler
• Foradil Inhaler
• Serevent
• Serevent Diskus
• Ventolin Inhaler
• Volmax
• Decongestant medications
• Amphetamines
• Diet pills

Common types of heart disease that may cause tachycardia include:

• Angina
• Cardiac arrhythmia:
• Atrial fibrillation
• Atrial flutter
• Tachy-brady syndrome
• Paroxysmal supraventricular tachycardia
• Wolff Parkinson White syndrome
• Heart attack
• Congenital heart disease
• Valvular heart disease
• Congestive heart failure

Common types of lung disease that may cause tachycardia include:

• Pneumonia
• Pulmonary embolism
• Asthma
• Chronic obstructive pulmonary disease
• Emphysema
• Lung cancer

Uncommon causes for tachycardia include:

• Pheochromocytoma
• Carcinoid syndrome
• Serotonin syndrome