Arthritis is caused by 'wear and tear' in the joints, usually due to over-exercising or ageing. Joints are protected by a fleshy pad or fluid which wears/dries out therefore causing rubbing ………. so as the joint moves it becomes painful because the proactive lining has worn away.
Bursitis is PAINFUL.
'itisi' = inflammation …….. i.e. appendicitis, meningitis ……
A bursa usually presents as red, hot, swollen and this can be relieved [hope you are not eating] by inserting a Very Long Needle and drawing off fluid which should be clear; if yellow or blood stained = inflammation. A bursa will re-fill until the infection is cleared away, either by continuous draining and/or ABs. I think that a bursa is usually situated in a 'gap' i.e. behind the knee cap …… or gap in the elbow …..
Arthritis pain will be relieved by swallowing pain relief.