A muscle cramp can happen at unexpected moments, usually after exercise: in bed, during a walk, after working in the garden. The muscle contracts with great intensity and stays contracted for about a minute before it relaxes. But how do muscle cramps occur?
They often occur in the legs after exercise, particularly in the heat, or after spending a long time in an uncomfortable position.
They may result from an imbalance in minerals and fluids brought on by dehydration.
Muscle cramps are usually not serious, although heat cramps can be a sign of heat exhaustion or, if accompanied by dizziness or disorientation, they may indicate impending heat stroke, which is serious. If you experience muscle cramps regularly, call your doctor.