Foot cramps at night are considered to be caused by hypocalcemia, excessive fatigue, lumbar spine disease, and neurological disease. 1. Hypocalcemia: It refers to a series of symptoms triggered by the low level of calcium ions in the blood serum, which leads to abnormal tissue function. Hypocalcemia can cause muscle spasms, and is prevalent in the lower limbs and face, back, etc., so it can cause foot cramps. 2. Excessive fatigue: such as long-distance running, mountaineering, etc., these activities are the foot to support the weight of the whole body, so it will cause foot fatigue, when fatigue to a certain extent, muscle spasms will occur, and generally can be relieved after rest. 3. Lumbar spine diseases: such as disc herniation, lumbar spinal stenosis, etc., resulting in nerve roots, spinal cord irritation or compression, and the innervated area of numbness, twitching, can also cause foot cramps. 4. Neurological diseases: such as encephalitis, cerebrovascular disease, Parkinson’s disease, etc. lead to central nervous system damage, will also appear at night sleep foot cramps. It can be seen that the causes of foot cramps at night are more reasons, such as frequent attacks or has not been able to relieve, you should go to the hospital in a timely manner, improve the relevant examination, clear cause of the disease, and then follow the doctor’s instructions for targeted treatment, so as not to delay the condition.