Vitamin D3 deficiency may cause rickets, osteomalacia and other symptoms. 1. Rickets: low levels of vitamin D3 in the body can also lead to bone calcium absorption disorders, this time the bone will become soft, X-shaped legs or O-shaped legs, chest deformity, children may also have slower teething, prone to dental caries, as well as impaired muscle development. 2. Bone softening: also known as osteoporosis, is a relatively common lesion among the elderly, because the gastrointestinal tract of the elderly absorption function is not good, outdoor activities than the young people are less, which will lead to the emergence of some pathological fractures. If the above symptoms occur, it may be a manifestation of vitamin D3 deficiency, it is recommended to go to the hospital in time for reasonable treatment.