For the causes of calf belly throbbing, the reasons are as follows: 1, calf cramps: mostly seen in calcium deficiency, calcium ions can inhibit the excitability of the neuromuscular junction, calcium deficiency, neuromuscular junction excitability increases, often cause spasmodic pain in the calf, at night it will be particularly pronounced, there will be a cramp in the calf, sometimes because of the cramp in the calf, so that the patient is difficult to fall asleep, or have fallen asleep, then suddenly woke up by the 2, gastrocnemius muscle strain: for example, in strenuous sports, gastrocnemius muscle strain occurs, there will be a protective contraction of the gastrocnemius muscle, which will also have the calf belly throbbing.