Rickets is a type of disease caused by a lack of vitamin D, leading to disturbances in calcium and phosphorus metabolism in the body, and resulting in abnormal bone development. The most common form of this disease is nutritional rickets caused by a deficiency of vitamin D. This type of rickets is curable as it is a self-limiting disease. Generally, timely supplementation of vitamin D and calcium, along with sufficient outdoor activities, can lead to recovery after treatment. However, there are some special cases, such as severe liver and kidney diseases, which require addressing the root cause before the symptoms of vitamin D deficiency can be alleviated. Additionally, there are some genetic diseases for which vitamin D supplementation is ineffective, making their treatment more challenging.