Proper training and footwear are the best prevention. Stretching the calf muscles attached to the Achilles tendon is important before and after running or exercise. Using orthotics, or arch supports, in footwear can also help. Making sure that the back of the shoe is soft enough is another strategy.
Achilles tendinitis is usually not a permanent problem, although it may take a long time to heal. With repeated or severe stress, the Achilles tendon may rupture.
There are no risks to others.