You are like a magnet. Your core unconscious beliefs attract your reality. Scientists have proved that humans really do have a sixth sense - that lets them detect magnetic fields. Tests have shown that mankind may have the same innate sense of Earth’s magnetic field that has long been proved to exist in animals.
This means that we can sense a vibe coming from another human being. If what is at your core is fundamentally unhappy, unhealthy and miserable despite best efforts to disguise this, on another level what you’re radiating is putting a certain vibe out. This can be effectively covered up if you’ve had years of practice, but if you’re putting a disguise out to the world this will have an effect on your happiness and well-being, or could cause disease in you which later manifests as an illness.