 Unlike frostbite, trench foot does not require freezing temperatures; it can occur in temperatures up to and within as little as 13 hours.Exposure to these environmental conditions causes deterioration and destruction of the capillaries, and leads to morbidity of the surrounding flesh.Excessive sweating (hyperhidrosis) has long been regarded as a contributory cause; unsanitary, cold, and wet conditions can also cause trench foot.