How long does it take for tendonitis to heal itself depends on the patient’s specific situation, and patients with milder symptoms can heal themselves in about 30 days. For patients with more severe symptoms, it is usually difficult to heal on its own and requires timely symptomatic treatment. Tenosynovitis is caused by prolonged wear and tear of the tendon, resulting in localized swelling, pain, and inflammation. In milder cases, the tendon may heal on its own. In the early stages of symptoms, it is important to take rest and avoid moving the joints to prevent accelerated deterioration of symptoms, which usually improves gradually in about 1 month. If the condition is more serious, targeted treatment is required according to the situation, using pharmacological treatment or physical heat treatment, such as hot compresses and massage. If the effect is still not obvious, it is recommended to take closed injection for conservative treatment. If the above methods are ineffective, surgery should be considered at the orthopedic department of the hospital. During the treatment period, it is necessary to pay attention to more rest, reduce activities, pay attention to the warmth of the painful area, and once abnormalities are found, timely treatment is required.