Problems with the kidneys cause cramping in the legs

Cramp is muscle spasm. Cramp is quite normal for doing regular exercises people, because supersession produces acidity substance, it leads to appear muscle spasm. People with kidney problem not only legs cramp, but other parts of body also cramp, just legs cramp symptom appears frequently. The reason of cramp is lack of calcium.
Inorganic substance phosphorus restrains absorb calcium, the proportion of calcium and phosphorus is 1:05 in health body. Only the proportion is like this the calcium will be absorb by human body. Kidney with problem causes kidney function dysfunction, the kidney can not excrete phosphorus but excrete calcium. Calcium excreting is because of too much phosphorus, it brings about hyperphosphatemia, and this symptom leads to lack of calcium. Furthermore, oxalate also restrains absorb calcium, because oxalate and calcium forms to be calcium oxalate. Calcium oxalate is insoluble in water. A larger number of calcium oxalate stores in body easily lead to urinary calculi, it makes kidney damage worse.
Vitamin D also influences absorb calcium. There are two ways to get vitamin D: one is from food intake, another is own body producing. Vitamin D only exists in animal foods; there is no vitamin D in plant foods. According to food limitation, there are many foods they are not allowed eat, they can not get vitamin D from foods. They lay in bed for a long time, the time of staying in sunshine is very short, the body can not produce vitamin D without sunshine, these are the reasons of lack vitamin D.
Damaged kidney can not produce active hydroxylase; hydroxylase is the rate-limiting enzyme to produce catecholamine. Rate-limiting enzyme is slowest enzyme in whole metabolism; it influences whole speed of metabolism, also may change the direction of metabolism. Catecholamin includes dopamine, noradrenaline, and epinephrine. Hydroxylase exists in renal cortex cell mitochondria. Lack of hydroxylase leads to not be able to produce active vitamin D3. In gastrointestinal tract active vitamin D3 promotes absorption of calcium; people who have kidney problem can not produce active vitamin D3, so the hypocalcemia will arise.

If people who have kidney problem would like to stop cramp, they should replenish calcium; they should eat some rich calcium foods, such as milk, they should be in sunshine frequently. The good time for being is before 10 am and after 3 pm. There is too much harmful substance in the sunshine at noon. Before eating vegetable, the vegetable must be boiled a while and damage the oxalate in vegetable by heating. They’d better not eat high oxalate food, for example spinach, beans, grape and so on.