"You had better consult a physician" is a common phrase used to give strong advice or suggest something that is important to do. "Had better" conveys a sense of urgency or potential consequences if the advice is not followed. It's similar to saying "It would be better if you consulted a physician." The past tense form "had" is used here in this construction, even though it doesn't refer to a past event. It's part of the idiomatic expression "had better".
You ________ better consult a physician.
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