Running causes constant pounding on the feet as pressure is exerted on the bones and the ligaments of the foot which causes damage and conditions such as plantar fasciitis, heel spur, shin splints and others.
Running enthusiasts have a tendency to exercise through the pain barrier and therefore they become vulnerable to sport related injuries. Blisters are common as a result of friction as are blackened toenails from compounding pressure. If the damage is coninuous and prolonged then the nail root may also be damaged and may grow back thickened or distorted and in some cases can lead to the loss of the nail. The use of orthotics to maintain the foot in its correct biomechanical position can reduce injury and discomfort.
Because the forefoot is subjected to so much pressure it is not uncommon for runners to suffer from metatarsal-head and metatarsal stress fractures. Also runners place extra stresses on their feet which stretch the muscles and ligaments at the sole of the foot. This may lead to an inflammation of the muscles which can be very debilitating and painful - a condition known as Plantar Fasciitis. Again prevention can be aided by orthotics to correct the way the foot is used in action.
Athletes foot is prevalent but maintianing hygiene with regular washing, requent changes of trainers and socks and using powers to absorb excess moisture will help to prevent the condition.