Rickets generally refers to vitamin D deficiency rickets, mainly due to insufficient vitamin D in children, leading to calcium and phosphorus metabolism disorders. It is a chronic nutritional disease characterized by skeletal lesions. The main manifestations are changes in the fastest growing parts of the skeleton, which can also affect muscle development and changes in neural excitability. The initial symptoms of rickets are common in infants, especially those under three months old. The main symptom is increased neural excitability; the child is particularly prone to being agitated, irritable, crying, sweating, and shaking their head due to scalp stimulation, but these are not specific symptoms of rickets. Therefore, blood tests are still necessary in the early stages, showing decreased levels of 25-hydroxyvitamin D3, blood calcium, and blood phosphate, increased PTH, normal or slightly elevated alkaline phosphatase activity, and normal or slightly blurry calcification zones in skeletal X-rays. These are the early manifestations of rickets.