Sudden convulsive tension (tonic convulsions) often last for three minutes or more and occur with monotonous sedentary work, when there is a pinched nerve the muscles in the muscular canal, prolonged walking, or hypothermia while swimming in cold water or in winter. In addition, seizures can begin as a result of excessive stress on the leg muscles, insufficient warm-up or increasing the volume of training. Such phenomena can occur in healthy people.

The reason for the localized tonic seizures can also be a violation of the biochemical and electrolyte composition of blood. They are formed when a significant loss of body salts, which develops when a decrease in blood calcium, potassium or magnesium, as well as the lack of vitamin D.

Cramping calf muscles can result from severe anemia. Most often it occurs in pregnant women, especially when there is a deficiency of iron in hemoglobin. This interferes with the exchange of mineral substances, the external manifestation of what are muscle cramps of the legs.

If a person for a long time, aching and swollen legs, he feels a sense of gravity that cause seizures, over time, constant nature, it can speak about the development of varicose disease. Varicose veins are also common among expectant mothers, when the growing uterus compresses the lower floors and the iliac vein. As a result, increases variceal pressure.

Often the cause of leg cramps can be a source of irritation in the motor area of the brain. This phenomenon is most common when starting the stroke or during the formation thereafter, and also in infectious lesions of the nervous system (influenza, SARS).

Cramps in the extremities are often observed in local hypoxia (lack of oxygen) due to vascular disorders in them, and when there are changes of innervation in spinal osteochondrosis. The nerve roots are compressed, and disturbed function of motor nerves.

Sometimes leg cramps occur in diseases of the nervous system (neurosis, tetanus). In some patients, they develop or are aggravated by external stimuli (if you prick the leg with a needle, alcohol abuse and poisoning). The above diseases require careful monitoring by the attending physician.