Is chest x-ray 2x a week harmful?

Not if needed: The radiation dose from a chest x-ray is relatively low with modern equipment. If there is a medical indication for that type of frequent follow-up then the small risk of the radiation is felt to be justified. What is being checked to often?

Not usually: As long as this is not perfomred for a prolonged period of time. Chest xray is low radiation burden but can accumulate if two xrays a week for months.If seriously ill and measure taken to preserve life or cure illness then benefits out weigh risks.