Fluid accumulation in the Achilles tendon is considered to be a possible cause of Achilles tendonitis. If the symptoms of pre-Achilles tendonitis are mild, you can relieve the tension of the Achilles tendon by applying pressure; if the symptoms of Achilles tendonitis are more serious, it is not recommended to apply pressure, or it may lead to aggravation of the condition. A common cause of fluid buildup in the Achilles tendon is Achilles tendonitis, which may be caused by chronic strain on the Achilles tendon due to excessive physical activity, excessive weight-bearing exercise, etc. This leads to aseptic inflammation of the Achilles tendon, resulting in inflammatory exudation around the Achilles tendon. If the symptoms of pre-Achilles tendonitis are mild, you can massage the gastrocnemius muscle in the calf area through the technique of pressure to relax it, which can relieve the tension of the Achilles tendon. If the patient’s Achilles tendonitis symptoms are more serious, it is not recommended to press, because the pressure on the Achilles tendon will aggravate the pain, and is not conducive to the absorption of fluid, which may lead to aggravation of the condition, should be promptly to the hospital for treatment.