One of the main causes of any type of cramping, including foot cramps, is dehydration. If you do not take in enough water, your tissues and organs cannot function properly. If you become dehydrated, your muscles will not get the water that they need. When your muscles do not have enough water, they will start to malfunction. Muscles malfunctioning may be experienced in different ways, but ultimately will cause you to experience the spasms and pain that are associated with having cramps.
Most of the time, dehydration is a symptom of not taking in enough water. However, some health conditions may cause you to lose fluid. Some examples of health issues that cause a person to lose fluid are gastroenteritis or any infection that causes you to vomit or have diarrhea. If you are experiencing foot cramps, try drinking some water to help alleviate the pain.