Many causes can cause thigh cramps. Muscle cramps in the thighs are spontaneous tonic spasms of the muscles and tend to occur frequently in the calves and thighs. On the one hand, there are systemic factors, such as high fever, epilepsy or even calcium deficiency that can cause thigh cramps at night. On the other hand, certain local factors, such as fatigue due to rapid exercise or work, can cause thigh cramps while sleeping. Sleeping in the wrong position can also cause thigh cramps, because prolonged supine lying makes the quilt pressed on the surface of the feet, or prolonged prone lying with the surface of the feet against the bed causes the leg muscles to be in a state of absolute relaxation for a long time, which can cause passive muscle spasms. At the same time, due to severe fatigue, insufficient sleep and rest or too much rest, may cause the local muscles of the thighs to have an accumulation of acidic metabolites, which can cause muscle spasms. In addition, if you encounter cold stimulation, like at night in winter due to the cold stimulation of the leg placed outside the quilt, it may cause thigh cramps. If you have thigh cramps at night, the treatment is to actively treat the original cause and treat the symptoms, such as physical cooling or strengthening local warmth in patients with high fever.