The causes of leg and arm cramps may include calcium deficiency and vascular disorders of the lower extremities, while vascularity is obviously mostly caused by varicose veins. If accompanied by the above two symptoms, there may be two causative factors at the same time. 1. Calcium deficiency: Pregnant women as well as lactating women and the elderly are prone to it. Calcium ions play a vital role in muscle contraction, and when the concentration of calcium ions in the body is too low, muscle contraction causes cramps. 2. Localized compression: mostly caused by standing for a long time, sleeping in an improper posture, etc. Prolonged compression of the legs and arms leads to transient ischemia of the muscles, causing cramps. 3. Lower extremity vascular disease: the elderly, diabetic patients are more common, lower extremity arteriosclerosis occlusion when the narrowing of the blood vessel lumen affects the blood supply, the lower extremities for a long time cramps, characterized by progressive aggravation at night. Obvious blood vessels in the legs and arms may be caused by superficial veins in the arms, mostly occurring in people with less subcutaneous fat and thinner skin, or caused by accelerated blood circulation and blood vessel filling after exercise, which is a normal physiological phenomenon. Pathological conditions such as excessive venous pressure, poor blood flow in the veins, stagnation in the blood vessels, vein distortion and expansion, varicose veins, leg and arm blood vessels appear obvious. If both leg and arm cramps as well as vascular visibility occur at the same time, two causative factors may be present at the same time, i.e., calcium deficiency, localized compression, vascular disease of the lower extremities, and varicose veins. There are many causes of leg and arm cramps and obvious blood vessels, leg and arm cramps and obvious blood vessels, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor combined with the relevant examination to clarify the cause of the disease, so as to avoid delaying the condition.