Plantar fasciitis causes pain in the bottom of the heel. The plantar fascia is a thin, web-like ligament that connects your heel to the front of your foot. It supports the arch of your foot and helps you walk. Plantar fasciitis is one of the most common orthopedic complaints.
Bursitis is the inflammation of one or more bursae (small sacs) of synovial fluid in the body. They are lined with a synovial membrane that secretes a lubricating synovial fluid. There are more than 150 bursae in the human body. The bursae rest at the points where internal functionaries, such as muscles and tendons, slide across bone.
The last major cause of bursitis is an infection. An infected bursitis, also called septic bursitis, occurs when there is infection within the bursa. There is usually a break in the skin over the bursa that causes the infection, but there can also be infection spread to the bursa from within the body.