Tendinitis Vs. Bursitis 

Tendinitis and Bursitis have shared characteristics but involve different structures of the shoulder. Both deal with inflammation within the joint.

Tendinitis: Inflammation of the tendon, the rope-like, fibrous tissue that connects muscle to bone. When a muscle flexes or relaxes it pulls on the tendon, which then causes the bone to move.

Bursitis: Is the inflammation of the bursa, fluid filled sac, which acts as a cushion between bones and the tendons or muscles surrounding the bone. The bursa greatly reduces the friction within the joint. 

Cause 

Tendinitis:

• Acute injury 
• Repetitive motions

Bursitis:

• Acute injury
• Repetitive motions 
• infections/conditions like gout or arthritis  

Treatment

• Resting the affected area -the first step to healing.  Try avoiding the aggravated motion for a little while to allow the inflammation to decrease. 
• Applying an ice pack -helps control the inflammation and decrease swelling. 
• Nonsteroidal anti-inflammatory drugs -Advil (ibuprofen), Aleve (naproxen), and aspirin are popular choices to further help decrease inflammation. 
• Cortisone injections–  Cortisone is a powerful anti-inflammatory drug that provides pain relief. Unfortunately, this is only a short-term pain relief option ; therefore, less effective as a long-term therapy.
• Physical therapy– can strengthen the surrounding musculature to alleviate stress on the affected area. Strengthening can help  prevent a recurrence. * In cases of infection caused bursitis, antibiotics may be prescribed.