Heart Block Symptoms

Heart Block Symptoms


Heart block, also known as atrioventricular (AV) block, is a condition that affects the electrical conduction system of the heart. It occurs when the electrical signals that regulate the heartbeat are delayed or blocked as they travel from the upper chambers (atria) to the lower chambers (ventricles) of the heart. This disruption in the normal conduction can lead to a variety of symptoms, ranging from mild to severe. In this blog section, we will explore the common symptoms associated with heart block and discuss the importance of seeking medical attention if you experience any of these signs.

Mild Symptoms

In some cases, heart block may not cause any noticeable symptoms, especially if the condition is mild or intermittent. However, as the severity of the block increases, symptoms may become more pronounced. Mild heart block symptoms can include:

1. Fatigue and weakness: Feeling tired and lacking energy is a common symptom of heart block. This occurs because the heart is not able to pump blood efficiently, leading to reduced oxygen supply to the body’s tissues and organs.

2. Dizziness and lightheadedness: When the heart’s electrical signals are disrupted, it can affect the normal blood flow to the brain, resulting in dizziness and lightheadedness. These symptoms may be more pronounced when standing up or changing positions quickly.

Moderate Symptoms

As heart block progresses, the symptoms may become more noticeable and interfere with daily activities. Moderate heart block symptoms can include:

1. Chest discomfort: Some individuals with heart block may experience chest pain or discomfort. This can range from a mild pressure-like sensation to more severe pain that radiates to the arm, jaw, or back. It is important to note that chest pain can also be a sign of a heart attack, so it should always be taken seriously and evaluated by a healthcare professional.

2. Shortness of breath: Heart block can lead to fluid accumulation in the lungs, causing difficulty in breathing. This symptom may worsen during physical activity or when lying flat. If you find yourself struggling to catch your breath, it is essential to seek medical attention promptly.

Severe Symptoms

In severe cases of heart block, the electrical signals may be completely blocked, resulting in a complete absence of conduction between the atria and ventricles. This can lead to a significant decrease in heart rate and more pronounced symptoms, such as:

1. Fainting or syncope: When the heart rate drops significantly due to complete heart block, it can cause a sudden loss of consciousness. Fainting spells should never be ignored, as they can be a sign of a life-threatening condition requiring immediate medical intervention.

2. Bradycardia: Bradycardia refers to an abnormally slow heart rate. In severe heart block, the heart rate can drop below 40 beats per minute. This can cause symptoms such as fatigue, confusion, and even heart failure if left untreated.


Heart block symptoms can vary depending on the severity of the condition. While some individuals may experience mild symptoms such as fatigue and dizziness, others may develop more severe symptoms like chest pain and fainting. It is crucial to recognize these signs and seek medical attention promptly to receive an accurate diagnosis and appropriate treatment. Remember, early intervention can significantly improve outcomes and prevent potential complications associated with heart block. If you suspect you or someone you know may be experiencing heart block symptoms, do not hesitate to consult a healthcare professional for a thorough evaluation.

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