Knee cramps may be caused by knee fasciitis, calcium deficiency and osteoarthritis. 1. Knee joint fasciitis: it mainly leads to stretching of the fascia when the knee joint moves, thus causing obvious cramps in the knee area. 2. Calcium deficiency: after the patient suffers from calcium deficiency, the lack of calcium ions causes a decrease in muscle excitability, resulting in localized muscle spasms in the knee, triggering pain symptoms. 3 osteoarthritis: due to the damage of the cartilage of the bone joints, it will lead to obvious swelling and pain in the knee area, deformity of the situation, and this pain is mainly caused by obvious cramps. There can also be many reasons for knee cramp pain. Patients with knee pain are advised to go to the hospital to find out the cause of the disease, and target treatment according to the cause.