Hello...... In most cases, experiencing a plugged ear after swimming means that water is trapped in your ear. During diving and swimming, water naturally enters the ear canals as you dip or submerge your head and move through the water. Normally, this water drains from your ears once you raise your head from the water, but in some cases, the liquid remains in your ear canal, often trapped between chunks of earwax. The prolonged presence of the water in your ear generally produces a plugged-ear sensation.consult ent specialist