In the poem "Sea Fever" by John Masefield, why is "Sea Fever" a good title for the poem?

"Sea Fever" is an excellent title for this poem because it
refers to the way that for some people the desire to see the sea and be close to it and
sail upon it can act in the same way as a fever, which cannot be shaken off. Note how
the all-consuming desire of the speaker dominates the poem, with each stanza beginning
with the same phrase:

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I must go down to the seas
again...

The repetition
emphasises the way that this desire dominates the speaker and he is unable to think of
little else except for the sea and how it sounds, feels, looks, tastes and what is
associated with it. If you think of other kind of "fevers" that we can get, we can be in
a "fever" for love, when all we do is think of the object of our affection, or we can be
in a "fever" for a particular sport when an important match is being played. It is this
kind of single-minded focus to the exclusion of everything else that is captured in the
title of "Sea Fever."