Calf pain on the second day of stair climbing is usually due to lactic acid accumulation or muscle strain, patients can take general measures, medication, etc. for relief. 1. Lactic acid accumulation: Lactic acid is the product of anaerobic metabolism of glucose in the body, if the patient usually has less exercise and suddenly performs excessive stair climbing, it may lead to excessive synthesis of lactic acid and accumulation of lactic acid in the calf area, thus causing calf soreness. At this time, the patient can keep climbing stairs daily, and use hot towels on the sore parts after exercise to promote lactic acid excretion and relieve the symptoms. 2. Muscle strain: this disease is usually due to the patient in a short period of time to carry out too much stair climbing action, resulting in rapid and strong contraction of the calf area muscles, elongation, caused by muscle tearing. Patients should first pay attention to immediately stop the movement, try to bed rest, and cold compresses, elevate the calf, generally within a few weeks can be self-recovery. Patients with stronger pain can take celecoxib, ibuprofen and other non-steroidal anti-inflammatory drugs for pain treatment as prescribed by the doctor. Climbing stairs the next day calf pain patients, if it is difficult to relieve, it is recommended to first consult a doctor for examination, to clarify the specific causes of treatment under the guidance of a doctor.