Heart Palpitations, Low-Grade Fever, and Weakness in Children: What You Need to Know

If a child experiences symptoms such as heart palpitations, low-grade fever, and weakness, it's crucial to consider the possibility of myocarditis or fulminant myocarditis. These conditions require immediate medical attention. Identifying the underlying cause as quickly as possible is essential, especially during the fall and winter months when viral infections are more common. It's recommended to visit a hospital for diagnostic tests including cardiac enzyme levels, electrocardiogram (ECG), and chest X-ray.

Key Diagnostic Steps for Suspected Myocarditis

A chest X-ray may reveal an enlarged heart silhouette, which can be a red flag. An ECG might show ST-segment elevation, premature beats, or even abnormal Q waves and reduced QS waves — all of which should raise concern. These findings, combined with elevated cardiac enzyme levels, can help confirm a diagnosis of myocarditis.

What to Do If Initial Tests Are Normal

Even if initial blood tests for cardiac enzymes and troponin levels come back within normal ranges, close monitoring for 2–3 days is still advised. In some cases, symptoms may initially appear mild or non-specific, but could worsen over time. A follow-up ECG may reveal new abnormalities, which could indicate the onset of myocarditis.

When to Seek Immediate Help

If the child's condition deteriorates — such as increased fatigue, worsening heart rhythm issues, or difficulty breathing — urgent medical evaluation is necessary. Early detection and treatment are critical in preventing severe complications from myocarditis.