A foot bursitis is named after your bursa, which are fluid-filled cushions that protect your body’s joints. These cushions help you absorb shock, keep your joints moving smoothly, and prevent irritation from where your tendons and ligaments pass over your bones.
Although there is only a small number of bursae that occur naturally in the foot, the body creates more bursae in areas where pressure and friction of great. As we exercise, the ground surface and the shoes we wear play an important role in how much trauma our feet experience. In short, every step you take can cause a small amount of damage to a particular area in the foot which can increase the risk of bursitis.
Unfortunately, your bursa can become inflamed as your ability to absorb shock decreases, which causes the area around your joints to become irritated. In severe cases, the bursa will appear as a bump and is usually red, appearing extremely tender and painful. This swelling can hamper your ability to move your toes, foot, or ankle as the range of motion in the joints is affected.
Common causes of foot bursitis include:
- A sudden injury
- Too much repetitive motion of your joints, such as from over-exercising
- A sudden twisting or rapid joint movement
- Overuse and repeated movements
Common symptoms associated with foot bursitis include:
- Pain or ache in the middle part of the underside of your heel
- An increasing pain or discomfort while participating in weight-bearing activities
- Pain and swelling under the heel
- Redness under the heel