why is that when our legs are at rest we can sometimes feel our kneecaps “grumble” or “vibrate” slightly when we touch them?

Question

why is that when our legs are at rest we can sometimes feel our kneecaps “grumble” or “vibrate” slightly when we touch them?

In: Biology

Answer 1

Two reasons:
1. Your body is constantly moving inside. Muscles relax, blood gets pumped, gas escapes from between your various cartilages, etc. These can cause sensations that are very slight, but can definitely feel like that. When you pop your fingers, it’s a similar cause.

2. “VLS, Vibrating Leg Syndrome”. Practically everyone has a vibrating smartphone in their pocket for 16 hours a day. Our brains get happy when we get a message, so we’ve associated the phone’s vibration with that joy. Every now and then, we feel something in our leg, and our brains REALLY wants it to be a message, so it feels like a vibration. Some people even claim to hear their notification tone often, despite not receiving a message.