It's terrible luck that they're represented by the crab, because they're not actually crabby very often.
Cancer's extreme sentimentality even beyond the norm for water signs.
They are a cardinal modality, which means they don't just wallow in their emotions, but act on them by being supportive, caring, loyal, and protective.
They do this despite the fact that they may incur costs or receive no tangible benefit themselves.
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Cancers, ruled by the ever-maternal moon, are born with a desire to help others grow, heal, and reach their potential.
They will bake cookies, bring care packages, and visit you in the hospital after major surgery or tonsil removal.
Perhaps most impressively, they will only ask that you feel better.