I'm sorry to hear about the pain and difficulty moving your arm after the gym. This could be due to muscle strain, overuse, or possibly an injury such as a sprain or tendon issue.

Here are some steps you can take to reduce the pain and improve mobility:

• Rest: Avoid using the affected arm to prevent further strain.
• Ice: Apply a cold pack wrapped in a cloth to the painful area for 15-20 minutes every 2-3 hours during the first 48 hours to reduce swelling.
• Compression: Use an elastic bandage to gently compress the area if there is swelling, but avoid wrapping too tightly.
• Elevation: Keep your arm elevated above heart level when possible to reduce swelling.
• Pain relief: Over-the-counter pain medications like those containing etoricoxib (a COX-2 inhibitor) can help reduce pain and inflammation, but these should only be taken after consulting a doctor to ensure they are safe for you.

If the pain is severe, you cannot move your arm at all, or if you notice swelling, numbness, or weakness, it is important to seek immediate medical attention. You may need evaluation by an orthopedic specialist to rule out fractures, tendon injuries, or nerve involvement.

Please consult an orthopedic doctor promptly to get a proper diagnosis and treatment plan tailored to your condition. If the pain worsens or you experience other symptoms like numbness or severe swelling, consider visiting an emergency facility.To narrow down potential causes, we will need some more information.I am sorry to hear that you are in pain. Please tell me your age and gender.