I have etd. i am a runner. when i run lately i hear a clicking sound in my inner ear which stops if i walk. is it harmful to keep running?

ETD in runners: Your ENT specialist would be in a better position to answer this question knowing your medical history and having discussed treatment options. For a chronic condition like ETD, a regular activity like jogging shouldn't be too risky while a bit annoying. I would make sure you give yourself regular breaks to make sure your condition keeps returning to normal, while you seek additional advice.