When you get up in the morning with leg cramps, consider the following reasons: 1, calcium deficiency: calcium ions can inhibit the excitability of the neuromuscular junction. When there is a calcium deficiency, the excitability of the neuromuscular junction increases, thus causing spasmodic pain in the feet and hands, also called hand and foot cramps. Adults mostly show calf cramps, gastrocnemius muscle spasms occur, calf cramps are mostly at night, or especially obvious when you get up in the morning. 2, leg muscle strain: for example, during the day a lot of sports, or strenuous sports activities, can exist leg muscle strain, or leg muscle strain, will cause lactic acid to accumulate at the leg muscles, when the leg muscles produce damage, often Protective cramps, or leg cramps, occur, and are more pronounced at night or in the morning.