No — and this is a source of enormous and unnecessary reassurance for patients with serious underlying conditions. Bronchiectasis — the most common hidden cause of recurrent lung infections — is frequently invisible on a plain chest X-ray and requires a High-Resolution CT (HRCT) of the chest for diagnosis. At Pulmovista Clinics, I order HRCT for every recurrent infection patient whose chest X-ray is normal but whose infection history is clinically significant. The number of hidden diagnoses we find on HRCT in patients with ‘normal’ X-rays is consistently high.