### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Starting around 6 months ago, by stretching in the morning I had felt a pop in my sternum as you would if you were to pop your knuckles and it started out initially feeling good after it had popped. earlier tonight I was looking in the mirror and noticed that the pronounced portions of my clavicles were a little uneven and offset, mostly the clavicle on my left side was much less protruded and wasnt really where it normally is. I have also been having a tingling feeling down the backside of my left arm it comes and goes and usually lasts around 20 min. Any idea what is going on?

### output:

Hi, You have mentioned that you feel that your left clavicle is slightly depressed as compared to right one, but we as Orthopedic surgeons actually see a few points about any bone.- Is there any bone swelling or tenderness at any point over the left clavicle?- Any abnormal mobility?- Have you had any fracture in your clavicle or any other surrounding bone? If the answers to all these questions are no, then most likely there should not be any issue with your clavicle. What you could just be feeling is maybe difference in the soft tissue cover over the two clavicle bones. If you are still unsure or not convinced, no harm in getting an X-ray of the involved region. Now as far as tingling sensation over the left arm is concerned, it could be either some bit of stiffness or a nerve impingement which may be causing this. To manage it, I will advise early initiation of physical therapy to strengthen neck muscles, shoulder muscles and periscapular muscles. Posture maintenance is of paramount importance, and if need be modalities like TENS can be initiated for left upper limb. If you still do not feel symptomatic improvement, a few medications can be initiated in your case. You can discuss your case and treatment plans with a specialist in a greater detail in a private consultation. Hope I have answered your question. Let me know if I can assist you further. 