Exactly last week I was playing a rugby game and about 10 minutes in straight after or during a tackle my shoulder got twisted awkwardly and i felt and heard a click noise/ pop. The pain was moderate and worsened significantly when i attempted to clear out a ruck or push of the arm which my shoulder was hurting from. When the pain came from use it was sharp and felt like my shoulder was coming off so i went off. 7 days later and the sharp sudden pain still occurs for about 20 seconds if i use that shoulder. For example, when i lift up an ipad with my arm stretched out. Or if i attempt to run sometimes on every few steps my shoulder will feel painful and unstable. However, merely lifting my my arm up above my head does barely anything. The only thing that hurts slightly is when i try lift my arm behind my back, otherwise its just pain due to exercise. But, when this pain does come it is sharp and unsuspecting. Walking or using the computer doesn't hurt it at all. What could it be and when should i see a doctor? I can easily bring about the sharp pain if i hold i light weight with my arm stretched out to the side and move my arm up and down at a moderate to fast speed.
Added (1). The when the pain hits it feels primarily at the joint and doesn't feel stable. I've also experienced the pain whilst attempting a shot in basketball, so i stopped playing. Lifting my heavy school bag onto my back or walking with the heavy bag on also triggers the pain on frequent occasions.
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