I sometimes think that hate and love are two sides of the same coin. If we truly love something, doesn't that mean that we automatically hate that which seeks to destroy the thing we love? Unfortunately, that "thing" that we love is too often our own ego. The ego needs to create enemies to hate, in order to sustain itself. Eckart Tolle explains this in some detail, if you're willing to get aquainted with his ideas.
That's the sort of philosophical perspective on it. More concretely, I think of hate as a type of stress, that can have a potentially negative effect on your physiologically. But as long as you control it (and not vice versa), I don't necessarily think it will harm you in any tangible sense.
I think the line between love and hate is also quite thin. From the state of arousal that we call hate, you can quite easily shift to the state of arousal we call love.
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