Directly, I think that it doesn't cause wastage. It may cause some muscle atrophy due to lack of exercise.
Several conditions, such as multiple sclerosis, arthritis and lupus, cause muscle inflammation. Also overexertion in excerise can muscle inflammation
I have heard they cause muscle wastage after prolonged use, and are generally viewed as last resort for fibromyalgia etc..
Bacteria such as Gonococcus can cause Arthritis.
At this point the cause for arthritis is not known.
The cause for arthritis is unknown
No. Shingles can not cause arthritis. They are entirely different diseases.
No. However rhuematoid arthritis can cause heart damage.
No there is no known connection. The cause for arthritis is as yet not known.
Fibromyalgia does not cause arthritis in itself. Arthritis would contribute to the muscle fatigue and other symptoms of this disease.
At present the exact cause of arthritis is unknown however the cause for many forms of arthritis is carried in the immune system by the blood.
You should probably have your uncle ask the doctor to re-explain it for him, because it sounds like a miscommunication. Sleeping under a fan cannot cause arthritis, and it is unlikely the doctor meant that. There are different causes for arthritis, and only a doctor familiar with your uncle's condition can determine what the cause is.
Certain infections can or allergies can be the cause of arthritis However it sounds unlikely,