The symptoms of a "calcaneal spine" (or plantar fasciitis) are more or less important painful episodes located on the sole of the foot, or more precisely on the heel. The support under the heel, in the area of attachment of the fascia, can be very painful, and worsens during an effort. The pain gives the impression of a nail under the foot, this is called a "talalgia". Remember: if X-rays sometimes show a small ossification in the shape of a thorn (hence the term calcaneal spine), it is not that which is painful, but the fascia weakened!
For athletes, for example, the pain is accentuated during the sporting activity. Then can disappear. But sometimes, the pain wakes up as soon as the physical activity stops.
There are sometimes rebellious forms that can be related to several conditions: the compression of a nerve of the inner side of the ankle, another lesion such as the fracture of fatigue, or sometimes a tear of the fascia. In these persistent forms, additional examinations will be necessary (MRI, electromyogram ...).
Finally, in case of pain in both heels occurring in a young man, it must be verified that this is not related to inflammatory rheumatism: ankylosing spondylitis.