Sir, when i bent my head towards chest then there is a vibration in my hip or surrounding of tail bone from lower back and it spreads to abdominal also but causes no pain, only strong vibration, since 1 month.
Hi Welcome to Chat Doctor Forum Does this happen when you do this with a jerk? Any other symptoms/changes you are experiencing? This is a curious symptom, possibly neurologic, please visit a neurophysician, for an examination.  Take care