What is the difference between plantar fasciitis and Achilles tendinitis?

The main difference between plantar fasciitis and Achilles tendon inflammation is that the tissue structure involved in the inflammation is different, and the part where the symptoms occur is also different. Plantar fasciitis mainly shows pain symptoms in the sole and heel of the sole; Achilles tendon inflammation is pain in the Achilles tendon insertion point behind the heel. In addition, plantar fasciitis can be felt under the skin of the foot arch when the inflammation is more severe. Achilles tendon inflammation may be at the Achilles tendon insertion point, that is, behind the heel, when wearing shoes, the back of the shoe compression area shows corresponding protrusions and hyperplasia; in addition, plantar fasciitis involves the tissue structure of the plantar arch area of the plantar aponeurosis, which is a connective tissue fascia; Achilles tendon inflammation involves the Achilles tendon insertion point and the tissue structure around the insertion point.