Need help

When ever I do warm ups it just sing in general recently I get like a small tingle in my throat. I stop immediately but just wanna know what could the problem be ? 

I feel like I'm breathing correctly and have correct posture and it happens when I hit the smaller of high notes 

any clue ?

Is there any other sensation, in addition to tingling? I haven't run into that personally, but if there's pain or tightness in addition, I'd focus on reducing pressure, relaxing all muscles involved, and switching to any configuration that feels most comfortable (like an MM, NN, NG, or lip trill).