Sharp upper back pain on the left side when breathing deeply started after cycling it took more than 15 minutes until the pain disappeared...?

Upper back pain: The pain that you describe is typical of an inflamed rib head as it inserts into the spine. Anti-inflammatory medications, stretching and massage can help. Apply ice at night and moist warm heat in the morning. Chiropractors are helpful with this problem. Injection of the rib head with a cortisone shot is another treatment option. If the pain persists then a thoracic MRI scan is warranted.