Why Is the Tendon on the Sole of My Foot Very Hard?

A stiff sole muscle and tension are caused by factors such as excessive fatigue, plantar fasciitis, and hypocalcemia. Details are as follows:

1. Excessive Fatigue

Long-term exercise, wearing high heels, walking with heavy loads, and other behaviors can cause chronic strain, leading to muscle spasms in the sole of the foot. This manifests as localized muscle contraction and tightness, accompanied by pain. Patients can relieve symptoms through massage, traction, and other methods. After adjusting daily behavior, symptoms can improve, and there is no need for excessive worry.

2. Plantar Fasciitis

When patients develop plantar fasciitis, due to the presence of sterile inflammation in the plantar fascia, they will experience typical heel pain, accompanied by stiffness and tightness in the sole muscle. The vast majority of patients can alleviate symptoms through conservative treatment without affecting their normal lives.

3. Hypocalcemia

When the body has insufficient calcium intake and excessive calcium loss, it can easily lead to hypocalcemia. Calcium can reduce the excitability of neuromuscular tissue. When serum calcium concentrations are low, it increases the excitability of neuromuscular tissue. At this point, patients may experience cramps in the calves and sole of the foot. When touching the affected area, they may find the sole muscle stiff and tight. In daily life, attention should be paid to maintaining a balanced diet and nutrition, and exercise should be appropriately strengthened. If necessary, calcium supplementation as advised by a doctor can help improve symptoms. The prognosis for most patients is good.

In addition to the above reasons, a very stiff sole muscle may also be caused by other factors, such as lumbar disc herniation, spinal canal stenosis, rheumatoid arthritis, etc. Timely medical diagnosis and treatment are required.