Plantar Fasciitis

Plantar fasciitis is a painful inflammatory condition of the foot caused by excessive wear to the plantar fascia that supports the arches of the foot or by biomechanical faults that cause abnormal pronation. The pain usually is felt on the underside of the heel, and is often most intense with the first steps of the day. It is commonly associated with long periods of weight bearing or sudden changes in weight bearing or activity. Obesity, weight gain, jobs that require a lot of walking on hard surfaces, shoes with little or no arch support, and inactivity are also associated with the condition.

Plantar fasciitis was formerly called “a dog’s heel” in the United Kingdom. It is sometimes known as “flip-flop disease” among US podiatrists. The condition often results in a heel spur on the calcaneus, in which case it is the underlying condition, and not the spur itself, which produces the pain.

Plantar fasciitis usually develops gradually, but it can come on suddenly and be severe. And although it can affect both feet, it more often occurs in only one foot at a time. Watch for:

• Sharp pain in the inside part of the bottom of your heel, which may feel like a knife sticking in the bottom of your foot
• Heel pain that tends to be worse with the first few steps after awakening, when climbing stairs or when standing on tiptoe
• Heel pain after long periods of standing or after getting up from a seated position
• Heel pain after, but not usually during, exercise
• Mild swelling in your heel

Under normal circumstances, your plantar fascia acts like a shock-absorbing bowstring, supporting the arch in your foot. But, if tension on that bowstring becomes too great, it can create small tears in the fascia. Repetitive stretching and tearing can cause the fascia to become irritated or inflamed. The causes of plantar fasciitis can be:

• Physical activity overload. Plantar fasciitis is common in long-distance runners. Jogging, walking or stair climbing also can place too much stress on your heel bone and the soft tissue attached to it, especially as part of an aggressive new training regimen. Even household exertion, such as moving furniture or large appliances, can trigger the pain.
• Arthritis. Some types of arthritis can cause inflammation in the tendons in the bottom of your foot, which may lead to plantar fasciitis.
• Diabetes. Although doctors don’t know why, plantar fasciitis occurs more often in people with diabetes.
• Faulty foot mechanics. Being flat-footed, having a high arch or even having an abnormal pattern of walking can adversely affect the way weight is distributed when you’re on your feet, putting added stress on the plantar fascia.
• Improper shoes. Shoes that are thin-soled, loose, or lack arch support or the ability to absorb shock don’t protect your feet. If you regularly wear shoes with high heels, your Achilles tendon which is attached to your heel can contract and shorten, causing strain on the tissue around your heel.