Given the pounding your feet take while running, it's not surprising that you will have some pain occasionally during or after a run. Pes planus is a condition in which the arch or instep of the foot collapses and comes in contact with the ground. Knowing the cause is also essential in prescribing the best possible treatment. Fortunately, living with flat feet is not the end of the world. For the rare cases of pes planus that cause patients great discomfort, treatment is fairly easy and inexpensive. For starters, stay away from athletic shoes that advertise an arch support system or advanced inner soles. Many times, these athletic shoes are driven more by marketing than actually working to improve your gait Additionally, orthotic sole inserts and shoes specifically designed for podiatric conditions are your best friends. These shoes cannot only improve the comfort in your step, but your flat foot condition will improve as well. You may develop a flat foot on one or both sides of your body. Sesma AR, Mattacola CG, Uhl TL, et al. Effect of foot orthotics on single- and double-limb dynamic balance tasks in patients with chronic ankle instability. Hale SA, Hertel J, Olmsted-Kramer LC. The effect of a 4-week comprehensive rehabilitation program on postural control and lower extremity function in individuals with chronic ankle instability. Naowczenski DA, Ludewig PM. Electromyographic effects of foot orthotics on selected lower extremity muscles during running. Vicenzino B, Franettovich M, McPoil T, et al. Initial effects of anti-pronation tape on the medial longitudinal arch during walking and running. Hertel J, Sloss BR, Earl JE. Effect of foot orthotics on quadriceps and gluteus medius electromyographic activity during selected exercises. Bosch K, Gerss, J, Rosenbaum, D. Development of healthy children's feet - Nine-year results of a longitudinal investigation of plantar loading patterns. F shows the line from the cross-point of A and C to the contact point of the heel (i.e. on line E). We measured: the angle between A and D (V-V angle, the standard angle showing varus or valgus of the calcaneus relative to the tibia); the angle between A and B (A-P mortise angle: A-P mortise angle of the ankle relative to the tibia); and the angle between A and F (T-H angle: the angle between the tibia and the hindfoot). Pes plenus may not be apparent in the non weightbaring patient. The following medical conditions are some of the possible causes of Pes planus. There are likely to be other possible causes, so ask your doctor about your symptoms. Listed below are some combinations of symptoms associated with Pes planus, as listed in our database. Visit the Symptom Checker , to add and remove symptoms and research your condition. A condition in which one or more of the arches of the foot have flattened out. The following list of conditions have ' Pes planus ' or similar listed as a symptom in our database. Always seek prompt professional medical advice about the cause of any symptom. Select from the following alphabetical view of conditions which include a symptom of Pes planus or choose View All. Ask or answer a question about symptoms or diseases at one of our free interactive user forums. Depending on the seriousness of the onset of Pes planus, you may want to consult one of the following medical professionals. For those who experience pain from their flat feet, weight loss may help.