Cramps are muscle spasms, which are sudden, involuntary tonic contractions of muscles that cause stiffness, pain, and difficulty moving. The main causes of foot cramps are: (1) poor local circulation, peripheral vascular disease, etc.; (2) sudden changes in ambient temperature; (3) excessive emotional stress; (4) excessive water and salt loss, resulting in electrolyte imbalance in the body; (5) insufficient dietary minerals (such as magnesium and calcium). Muscle contraction and diastole require the participation of calcium ions, and if in the case of calcium and magnesium ion deficiency, muscle cramps will appear. The treatment of cramps can be divided into two parts, one for the acute stage and the other for the treatment of the root cause. In the acute stage, that is, when cramps occur, patients need to rest immediately, massage the cramped area gently, and gently stretch the muscle in the cramped area, because when you stretch the muscle, it will increase the tension of the tendon, and when the tension reaches a certain strength, the nerve will send impulses to the brain, and the brain will release messages to relax the cramped muscle in order to avoid injury to the tendon. Do not use too much force when stretching the muscles, so as not to strain them and cause secondary injuries. If the muscle cramp is very long, you can use hot or cold compresses to reduce the pain, or local spray or rub some loose tendon pain relief drops or ointment is also very effective. If the cramp occurs again, it is necessary to consider whether the muscle is overworked, or dehydrated, the former must stop activities to rest, the latter need to replenish water and electrolytes.