Most doctors worth their weight in medical degrees agree that by maintaining a balanced diet, leading an active lifestyle, and scheduling regular checkups, you’re on the right track when it comes to your health. But the truth is, healthy living can only do so much—the next best option is knowing our bodies well and recognizing when something isn’t right. Unfortunately, that’s easier said than done—because in those early stages, when intervention is typically most successful, the signs of serious health issues are also the most subtle.

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