When i was child i fell on my back and my chest start closing and i can't breath for a while then i was ok. what's the case&could it leave any damage?

More details: More details would be helpful during an inbox consultation. Have you had a chest image recently? do you have any problems exercising or with respiratory symptoms? If so, please book an appointment with a Pulmonologist. If you did not require chest tubes, oxygen, ventilatory support of any kind, most likely there is no long term sequelae.