It is unlikely to be due to "wear and tear".
Hi, thanks for writing to XXXXXXX
Pain occuring in any operated bone by internal fixation
(plates & screws) always indicates Infection (whether mild or moderate in intensity), unless proved otherwise.
of a bone (without any known injury
) always indicates that the involved bone is very Osteoporotic (weak) and are termed as Stress
Wear and tear is very very unusual at your age.
A detailed clinical examination and appropriate investigations are needed to know the exact cause of your symptoms.
Bone mineral density (BMD) test, Vitamin D blood estimation, Serum calcium levels are to be done to know the status of your bones.
The other possibility or cause for the pain through the clavicles that is occuring during cough might be due to the irritation of the apical pleura
of the lung by the tip of the screw (if it is protruding far beyond the clavicle margin downwards).
So, a thorough evaluation is needed to establish a proper diagnosis.
Hope I have addressed your query. Happy to help further