Heart Rate of 150 BPM: Causes, Symptoms, and When to Seek Care

A resting heart rate of 150 beats per minute (bpm) is classified as tachycardia (abnormally rapid heart rate). While not always immediately dangerous, it warrants medical evaluation to identify the underlying cause.

Potential Causes

• Arrhythmias (e.g., atrial fibrillation, supraventricular tachycardia)
• Hyperthyroidism (overactive thyroid)
• Anemia
• Dehydration or electrolyte imbalance
• Infection or sepsis
• Medication side effects (e.g., asthma inhalers, thyroid medication)
• Excessive caffeine or stimulant use
• Anxiety or panic attacks

Associated Symptoms

• Chest pain or discomfort
• Shortness of breath
• Lightheadedness, dizziness, or fainting
• Palpitations (awareness of rapid heartbeat)
• Fatigue or exercise intolerance

When to Seek Medical Attention

Seek immediate care if tachycardia is accompanied by chest pain, difficulty breathing, fainting, or confusion. Persistent unexplained tachycardia should be evaluated by a doctor, who may order an ECG, blood tests, or heart monitoring to determine the cause and appropriate treatment.