tick tock..

there's been a ticking noise in my ear lately..it comes and goes at random timings..infrequently but frequently enough to bug me! what the hell is it!! the first time i heard it was during football on sunday..while i was running..tick tick tick tick..when i stopped..it was gone..but after that day..it just comes and goes..damn! my brother said it is my heartbeat when it is not in sync with my hearing..my friend said it was due to exposure to loud music..i just think it's pretty irritating! =(