There is a common misconception that muscle weakness around a joint always causes pain within that joint. This could not be further from the truth! It is possible to have a weak and painful joint, but sometimes people also have pain when they are strong. Pain is often more complicated than faulty body mechanics or muscle weakness.
For the shoulder joint in particular, there are indicators outside of pain that point to muscle imbalances within the joint. These might include:
If you are experiencing any of these you could benefit from a shoulder strengthening program! Shoulders provide stability for use of the arm and hand, so shoulder joint health is very important. Consider seeing a physical or occupational therapist for an appropriate shoulder exercise progression based on your needs.