Symptoms of Osteochondroma
In many cases, solitary osteochondromas do not cause any symptoms, or symptoms may arise long after tumors develop. Osteochondroma is most often diagnosed in patients aged 10 to 30 years.

Symptoms of an osteochondroma include:

A painless bump near the joints. The knee and shoulder are most often involved.

Pain with activity. An osteochondroma can be located under a tendon (the tough, fibrous tissue that connects muscle to bone). When it is, the tendon may move and "snap" over the bony tumor, causing pain.

Numbness or tingling. An osteochondroma can be located near a nerve, such as behind the knee. If the tumor puts pressure on a nerve, there may be numbness and tingling in the associated limb.

Changes in blood flow. A tumor that presses on a blood vessel may cause periodic changes in blood flow. This can cause loss of pulse or changes in color of the limb. Changes in blood flow resulting from an osteochondroma are rare.

In some cases, an injury can cause the stalk of a pedunculated osteochondroma to break. This will cause immediate pain and swelling in the area of the tumor.