In folk custom across several cultures, an itchy palm means money is coming or going. Which hand means which depends on who you ask, and the versions often contradict each other, which is the clearest sign this is custom and not a rule.
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In folk custom, ringing in the ear means somebody is talking about you. The belief is old enough that the Roman writer Pliny the Elder recorded it in the first century. A ringing that keeps happening is a health question, not an omen.
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In Chinese popular custom, a twitching left eye is traditionally read as good fortune and a right eye as trouble, though some regions reverse it. In English folk custom, a twitching eye is said to mean a visitor is on the way, or tears. A twitch that lasts is a health question.
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It comes from old beliefs about the danger of a sneeze, such as the soul escaping or the heart stopping. A popular story credits Pope Gregory in a plague, and that story has no good support.
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