There are many causes of stiffness and tightness in the calves, such as lumbar spinal stenosis, calcium deficiency and chronic inflammation of the calf muscles. 1. Lumbar spinal stenosis: Lumbar spinal stenosis may compress the nerves of the lower limbs, resulting in neuropathic pain in the calves, which induces hardness and tightness in the muscles. 2. Calcium deficiency: Calcium deficiency causes increased muscle excitability, which leads to the feeling of hardness and tightness in the calf. 3. Chronic inflammation of the calf muscle: chronic aseptic inflammation of the local calf muscle can be caused by muscle strain, and the inflammation stimulation leads to the manifestation of hardness and tightness of the calf. There are many other causes of calf stiffness and tightness, it is recommended that such patients, go to a regular hospital, consult a professional doctor, cooperate with the doctor to complete the relevant examination, to clarify the cause, to avoid blind treatment.