Soreness in the Achilles tendon after playing soccer may be caused by strenuous exercise, or it may be caused by other reasons such as Achilles tendonitis, Achilles tendon injury, and ligament strains. 1. Strenuous exercise: After a long period of time without strenuous exercise, suddenly playing for too long may lead to the accumulation of lactic acid in the Achilles tendon area. This can lead to soreness in the Achilles tendon after playing, which is normal and usually improves after rest. 2. Achilles Tendonitis: The cause of Achilles Tendonitis is not yet clear, and it is considered to be caused by repeated strenuous stretching of the Achilles Tendon. Patients will have pain in the Achilles tendon, swelling of the Achilles tendon, redness of the skin and other manifestations, so the patients will have soreness of the Achilles tendon after playing football. 3. Achilles tendon rupture: Achilles tendon rupture is considered to be caused by sudden violence, cuts on the Achilles tendon, pulling on the Achilles tendon and other factors. Patients will have symptoms such as swelling of the heel, pain, impaired mobility, etc. Therefore, patients will show soreness of the Achilles tendon after playing soccer. 4. Other: ligament strain and tumor in the Achilles tendon after playing ball will also cause soreness in the Achilles tendon. If the Achilles tendon soreness is caused by strenuous exercise, no treatment is needed. If the Achilles tendon is sore after playing football caused by diseases, then you need to consult a doctor in time and follow the doctor’s advice.