Causes of Shortness of Breath: 5 Myths You Shouldn’t Ignore

Understanding the Real Causes of Shortness of Breath

When Every Test Says You’re Fine — But You’re Still Breathless

Shortness of breath can feel terrifying — especially when no one can tell you why it’s happening. While most people assume it’s a heart issue, the causes of shortness of breath can be far more complex. And if your heart tests are normal, it doesn’t mean the problem isn’t real.

Myth 1: If It’s Not Your Heart, It’s Just Anxiety

Anxiety can cause breathlessness, but it’s often overdiagnosed. Patients with chronic symptoms are frequently told “nothing’s wrong” — when in fact, they may have vascular issues, clots, or flow-related problems that require imaging to diagnose.

Myth 2: You’re Just Out of Shape

If walking up stairs or getting the mail suddenly feels exhausting, it’s not just aging. True causes of shortness of breath include:

• Pulmonary embolism (PE)
• Chronic DVT
• Lung scarring
• Anemia
• Diaphragm dysfunction
• Inferior vena cava (IVC) filter complications

Myth 3: It Must Be a Lung Problem

Not always. Even with normal lungs and oxygen levels, poor circulation or unresolved clots can make it hard to breathe. In some cases, imaging may reveal a hidden cause — like a chronic clot in the lungs or legs.

Myth 4: Inhalers or Heart Meds Will Fix It

If you’ve tried meds and still feel breathless, it may be time for advanced imaging. Interventional radiologists can offer targeted diagnostic tools like:

• CT pulmonary angiogram
• Perfusion scanning
• IVC filter evaluation or removal
• Clot-directed therapy

See how advanced imaging reveals hidden causes — NIH

Myth 5: You’re Just Overreacting

You know your body. If shortness of breath is new, persistent, or affecting your life, it deserves a deeper evaluation. Many patients find answers — and relief — through vascular imaging and interventional treatment.

Real Answers Start with the Right Questions

The causes of shortness of breath go far beyond the heart. If you’ve hit a dead end with traditional testing, don’t stop asking.

Explore more patient-first answers on our blog.