Feeling a little tired at the end of your day is normal. But if you've been feeling exhausted for weeks or months on end, even after what seemed like a good night's rest, you could have a blood disorder known as anemia.

Rheumatoid arthritis can last a lifetime. As the years pass, the inflammation caused by rheumatoid arthritis can spread to other organs, causing a variety of health problems. In some cases, the complications of rheumatoid arthritis can be deadly.