Plantar fasciitis is the most common cause of heel pain and is caused by repeated micro-trauma to the soft tissues of the sole of the foot, namely the fascia or connective tissue. The inflammation in these tissues causes pain and muscle spasms resulting in altered gait. Plantar fasciitis is common in middle-aged people. It also occurs in younger people who are on their feet a lot, like athletes or soldiers. It can happen in one foot or both feet. Plantar fasciitis is caused by straining the ligament that supports your arch. Repeated strain can cause tiny tears in the ligament. These can lead to pain and swelling.
It can be caused by prolonged standing or walking if poor biomechanics are present, especially if the client does not use arch supports. Additionally, a change of footwear from a more rigid to less rigid sole, or a sudden decrease in heel height can contribute to the condition.