The calf pain after climbing stairs is due to the calf muscle strain or spasm caused by climbing stairs, resulting in too much local lactic acid production, which is not excreted in time, so this situation will occur. Because the calf muscles did not do enough relaxation before climbing stairs, climbing stairs caused muscle strain caused by strain and muscle spasm, minor pain through rest, lower limb elevation symptoms can be significantly relieved, the problem is not big. If the pain is strong, you can do hot compresses, massage can be relieved, you can also use topical fotarine ointment, usually you can do calf muscle exercise, such as squatting against the wall and straight leg raising exercise. If there is still pain in the calf after treatment and not relieved, it may be caused by muscle damage or intermuscular vein thrombosis in the calf, which needs to be checked at the hospital for clear treatment.