Plantar fasciitis is a condition caused by repetitive activity that causes strain on the plantar fascia of the foot. It is characterized by intense pain in the heel and arch of the foot when getting up in the morning, after sitting for long periods of time, or during repetitive activities such as running. The plantar fascia is a thick band of connective tissue that runs along the bottom of your foot and connects your heel to the base of your toes. It acts as a shock absorber by supporting the arch of your foot. If the fascia gets overloaded with tension, this results in tiny tears that cause irritation, pain and inflammation. It may feel like a stabbing pain in the heel or arch of your foot or it may feel like more of a deep throbbing pain. The pain can last for just a few days or several years.