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Either you have costochondritis or Scalene Myofascial Pain Syndrome. When scalene muscle is the cause of pain, the pain is referred to chest, inner lining of scapula, shoulder, posterior and lateral sides of the arm right up to the thumb and index finger. When this muscle shortens, this can press on brachial plexus and the subclavian artery and can compress or irritate these structures and cause symptoms such as abnormal sensation, cold extremity, claudication, and lymphedema in the involved extremity. This is a major cause of TOS or thoracic outlet syndrome which occurs as the result of narrowing of space below and behind the collar bone. Hence bringing your arm down helps relieve the pain to some extent.
Chest pain aggravated by laughing yawning, moving in certain directions, stretching and deep breathing goes more in favor of costochondritis, which causes pain and tenderness at points where your ribs attach to your breastbone. The inflammation around the joint area gives sharp pain on taking a breath. This can also cause tenderness on pressing the area which pains. An orthopedic doctor can diagnose this for you. Generally there is no cause. However it can be due to infection, blow, injury, or fibromyalgia. It usually goes away on its own. Otherwise it can be treated with muscle relaxants, and non steroidal anti inflammatory drugs. It can also be muscle pull. Shingles can also start this way but unlikely as it has been for so long.
Please consult your PCP for primary examination followed by proper referral. It is difficult to comment beyond this at this stage. Take care!
Thank you for taking the time. I appreciate it. It used to come and go. It just seems like it is around now longer. I am terrible at trying to explain stuff like this. It also feels under my left rib like a soar feeling. Again thank you. Puts me in a better direction.