The right calf belly soreness, to consider the following reasons: 1, peroneus longus strain: may be due to excessive exercise during the day, causing the right calf peroneus longus strain, there may be a large amount of lactic acid gathered in the calf gastrocnemius muscle, it will be manifested as calf soreness, pain. 2, calcium deficiency: calcium ions can inhibit the excitability of the neuromuscular junction, when calcium deficiency, the excitability of the neuromuscular junction increases. Often manifested as spasmodic pain in the calves, especially at night will appear the calf belly cramps. In this case, regular blood calcium test must be conducted, if it is clear that there is low blood calcium, must be actively supplemented with calcium ions to correct the blood calcium. 3, fever: patients in high fever when the sugar metabolism is accelerated, a large number of lactic acid will accumulate in the calf, so there will also be joint and leg soreness, when the body temperature drops to normal, the soreness will disappear more quickly.