Yes, it could be related to upper back problems but since you find some relief with drinking, it may not be due to the spinal column. Firstly you must exclude any cardiac or pulmonary causes (refer to the articles on lung chest pain and heart chest pain). Then your doctor will need to confirm/exclude any gastric causes (refer to the article on Gastric Chest Pain). If you go through these articles then you may find more specific conditions which may present with symptoms similar to yours. Also consider chostochondritis and other causes of a popping sternum which may be relieved with deep breathing, yawning or stretching.

Since the pain is only upon touch and not brought about by any movement or other factors indicates that it is quite superficial. This may be related to injury and inflammation at the affected area that you may not be able to recall. The x-ray has not revealed any abnormality so it is unlikely a fracture. It could be more muscular in origin and the pectoral muscles could be the cause. Refer to the article on muscle chest pain and this may assist you further. Nevertheless consult with a doctor and get a second opinion if necessary.

This ‘clicking’ indicates slight inflammation of the joint between the sternum and rib (costochondritis) although it could also be related to a slight ‘dislocation’ (not a true dislocation). Stretching your arms wide or taking a deep breath will cause it to click and this is caused by your positioning when doing prolonged tasks. For example, leaning on one hand on the floor while reading (common for students who do not sit at a desk), often cause and aggravates the condition. The pain usually does pass if you stop doing whatever it is that is causing the condition. Usually the ‘awkward’ position is not causing pressure directly on the chest wall but is transferred through the arms or shoulders. If you have identified the problem, then stop repeating it but if it does not ease in a week or two, then yes, you will need to see doctor.

You don’t make mention of any other signs or symptoms, your age or any other medical information but be cautious about chest pain. It can sometimes be an indication of serious medical conditions. If in doubt, see your doctor immediately.

You may feel these ‘aches and pains’ in the sternum as you grow up which may be due to inflammation of the joint between the rib and sternum (costochondritis). In some young girls this is a chronic problem known as Tietze’s syndrome and this term is often used synonymously with costochondritis. You will need to be on medication for Tietze’s as the pain is ongoing. If this pain continues to persist or if you are experiencing any other signs and symptoms then I would recommend that you see a doctor. Your age does not put you in a high risk group for more serious conditions but it is nevertheless possible.