Tightness and stiffness of the calves may be due to the following reasons: 1, may be the existence of muscle spasm here. This is often due to the patient to do excessive activities, or do some too intense exercise, resulting in the muscles here to maintain long-term tension, and then spasm. 2, this situation may be due to the patient’s mental related factors. For example, if the patient is in a state of long-term tension and anxiety, the muscles of the whole body will maintain a very high muscle tension. At this time, it will be manifested as tightness and hardness of the calf. 3, this situation may be caused by excessive swelling of the calf. For example, if the patient has some serious heart, kidney-related diseases, or malnutrition and the lower limbs of the blood circulation of the relevant lesions, may cause serious swelling, which leads to tightness, hardness. Finally, this condition can also be caused by an infection in the calf area. For example, if the infection is caused by trauma or other infections in the surrounding area, then there will be a series of symptoms such as tightness, hardness, pain, redness and so on.