冻结肩，也被称为肩关节粘连性胶原病，是一种影响肩关节运动的疾病。它通常表现为肩关节僵硬、活动受限，给患者带来不适和疼痛。然而，许多人可能会惊讶地发现，冻结肩往往会在几个月到几年的时间内自愈。那么，为什么冻结肩会自愈呢？

首先，我们需要了解冻结肩的原因。冻结肩通常由于肩关节周围的软组织发生炎症引起，这会导致肩关节周围的胶原纤维增生和收缩。这种炎症可能由多种因素引起，包括损伤、炎症性疾病或长期保持相同的肩关节姿势。当胶原纤维收缩时，会导致肩关节骨头之间的空间变窄，从而使肩关节活动受限。

然而，冻结肩通常会自愈，这是因为我们的身体具有自愈能力。虽然冻结肩的确会给患者带来痛苦，但随着时间的推移，肩关节周围的炎症会逐渐减轻，并且软组织的胶原纤维也会慢慢恢复正常。这种自然的修复过程需要时间，通常需要数月到数年。一些研究表明，冻结肩最常见的持续时间为12至24个月。

此外，适当的治疗也可以促进冻结肩的自愈。物理疗法是治疗冻结肩常用的方法之一。物理疗法帮助恢复肩关节的活动范围和力量，并缓解疼痛。通过进行特定的运动和伸展，可以扩大肩关节的运动范围，并促进软组织的恢复。物理疗法还可以通过保持适当的肩关节姿势，预防冻结肩再次发生。

药物治疗也可以用于缓解冻结肩的症状。非甾体消炎药（NSAIDs）如布洛芬可以减轻炎症和疼痛。局部使用热敷或冷敷也可以缓解肩关节的不适。

总体而言，冻结肩能够自愈的原因是多方面的。首先，自然修复过程使肩关节周围的胶原纤维逐渐恢复正常，从而增加肩关节的活动范围。其次，适当的治疗可以促进肩关节的康复并减轻症状。通过物理疗法和药物治疗，患者可以恢复肩关节的功能。

In English:

Why Does Frozen Shoulder Heal on Its Own?

Frozen shoulder, also known as adhesive capsulitis, is a condition that affects the movement of the shoulder joint. It is characterized by stiffness and limited range of motion, causing discomfort and pain to the affected individuals. However, many people may be surprised to find that frozen shoulder often resolves on its own within a few months to several years. So, why does frozen shoulder heal on its own?

Firstly, it is essential to understand the underlying cause of frozen shoulder. The condition typically occurs due to inflammation in the soft tissues surrounding the shoulder joint, leading to the thickening and contraction of collagen fibers around the joint. This inflammation can be caused by various factors, including injury, inflammatory diseases, or prolonged maintenance of the same shoulder joint position. As the collagen fibers contract, the space between the shoulder joint bones narrows, resulting in restricted joint movement.

However, frozen shoulder often resolves spontaneously because our bodies have the capacity for self-healing. While frozen shoulder can indeed cause significant discomfort, over time, the inflammation surrounding the shoulder joint gradually subsides, and the collagen fibers in the soft tissues slowly return to their normal state. This natural healing process takes time, typically ranging from several months to a few years. Some studies indicate that the most common duration of frozen shoulder is 12 to 24 months.

Furthermore, appropriate treatment can facilitate the healing process of frozen shoulder. Physical therapy is one commonly used approach in the management of frozen shoulder. It helps restore the range of motion and strength of the shoulder joint, as well as alleviate pain. Specific exercises and stretches can widen the range of motion in the shoulder joint and promote tissue recovery. Physical therapy can also prevent the recurrence of frozen shoulder by maintaining proper shoulder joint posture.

Medication can also be used to alleviate the symptoms of frozen shoulder. Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen can reduce inflammation and pain. Local application of heat or cold packs can also provide relief to the affected shoulder joint.

In conclusion, there are several reasons why frozen shoulder tends to heal on its own. Firstly, the natural healing process allows the collagen fibers surrounding the shoulder joint to gradually return to normal, thus increasing the range of motion. Secondly, appropriate treatment can facilitate shoulder joint recovery and relieve symptoms. Through physical therapy and medication, individuals can regain shoulder joint functionality.