Sometimes pain is clearly indicative of conditions such as rheumatoid arthritis or osteoarthritis. Other times the pain does not fall neatly into a clearly delineated diagnosis. In such cases, the pain may be attributed to post-viral illness or the cause of the pain may be unknown. Rather than being limited to a few localised areas of the body, the pain may be rather more widespread throughout the body. The pain may be longstanding and may come and go. Irrespective of the diagnosis, drug treatment often involves strong anti-inflammatory medication, requiring increasingly higher dosages over time with diminishing relief. Once the drug treatment is discontinued, the pain tends to return full force.