Updated May 27, 2011.

If Lyme disease isn't treated, other symptoms can occur.

About 60% of people with Lyme disease who go untreated for many months with develop arthritis. Arthritis is very commonly found in the knees of these individuals, though it can be found in other large joints.

Five percent of Lyme disease sufferers who go untreated will go on to develop other health concerns, as well. These problems can include pain, numbness and tingling in hands or feet, problems with concentration and problems with short term memory.

Lyme disease is easily treated with common antibiotics. If you think you or your teen have been infected, call your primary care provider right away. Simple blood tests, that sometimes must be repeated to rule out infection, can give you and your family peace of mind.