When you have X-rays for medical purposes, they are used very briefly, just for a few milliseconds. The exposure is so brief, that the X-rays do not linger in the body. Hence they cannot have a cumulative effect. Hence, even if you had 3 X-rays for your pneumonia, do not worry. In all probability you will not need more X-rays, and even if you need another one, do not worry. This should not cause any harm.
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