What's the significance of Achilles tendonitis?

Needs to be treated. Typically achilles tendonitis is an overuse injury it can usually be treated with rest, ice and NSAID medications. In more difficulty cases it may require physical therapy to both alleviate the symptoms and work on stretching exercises to prevent future exacerbations.
Inflammation. Achilles tendonitis is a condition of irritation and inflammation of the large tendon in the back of the ankle. Achilles tendonitis is a common injury that tends to occur in recreational athletes. Overuse of the achilles tendon can cause inflammation that can lead to pain and swelling. If not allowed to rest this could eventually lead to achilles rupture.