Catarrh

Catarrh is blockages or discharge from the common cold, but also:

Time-varying properties

Blockage is often time-varying, e.g. some days are better than others, etc.. For example, a person can be entering the baths from a height of 5m on week, and the next week can be in severe pain entering from only the 1m board, or even just from the side of the pool, in which case the person is said to be "having a bad ear day".

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