Arthritis is 100+ different rheumatic diseases and conditions. The most common form is osteoarthritis. Other common forms are rheumatoid arthritis, lupus, fibromyalgia and gout. Some forms of arthritis can affect multiple organs.
Other Chronic Conditions
In This Section
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is an illness marked by extreme fatigue. People with ME/CFS may also have problems with sleep, thinking, pain and dizziness.