Vitamin C deficiency is mainly manifested as hair changes, bleeding symptoms, bone changes, and systemic symptoms. Hair changes: the most specific symptoms, as early as 3 months after the insufficient intake can appear, mostly limbs, back, buttocks and other parts of the hair follicle hyperkeratosis, bleeding around the hair follicle, petechiae, hair roots curling, brittle. Bleeding symptoms: bleeding of skin and mucous membranes, easy to appear subcutaneous petechiae and ecchymosis after skin collision and pressure, with auburn and bruises in many places on the body; swollen and bleeding gums. In severe cases, nosebleeds, protruding eye conjunctiva and eyeballs, occasional vomiting of blood, hematuria, and even intracranial hemorrhage (sudden severe headache, nausea and vomiting, drowsiness, or even coma, limb convulsions and epileptic seizures, etc.) may occur. Skeletal changes: necrosis of the gums and alveoli, loosening and loss of teeth; in children, gingival dysplasia. Systemic symptoms: pallor, dysphoria, generalized weakness, loss of appetite. Children also have irritability, slow weight gain, vomiting and diarrhea. Joint and muscle pain: bleeding from muscles or periosteum can lead to generalized muscle and joint tenderness, pain and pressure, and the pain may be severe. Special posture: this is a special symptom of children, children may be reluctant to move due to pain, pseudo-paralysis of the lower limbs, swelling, any movement of the limbs will cause pain and crying, preferring to take the two thighs abducted and the calves inwardly curved in a flat lying position, similar to the position of the clam. Secondly, a few children in the ribs, cartilage junction can appear sharp protrusions, medial can be found in the depression, arranged like a bead. In addition, children may experience shallow rapid breathing due to pain when the ribs move. If symptoms of vitamin C deficiency occur, it is recommended to use medication under the guidance of a doctor, and not to take medication without authorization.