Vitamin C deficiency can cause swollen and bleeding gums, subcutaneous petechiae, mouth ulcers, wounds that do not heal easily, generalized weakness, irritability and other symptoms. 1. Swelling and bleeding of gums: Vitamin C deficiency can cause swelling of gums and bleeding of gums when brushing teeth. 2. Subcutaneous ecchymosis: When vitamin C deficiency occurs, there will be subcutaneous ecchymosis after the skin is bumped, and it is not easy to be absorbed. 3. Mouth ulcers: If mouth ulcers do not heal easily, you should think of the possibility of vitamin C deficiency. 4. Wounds do not heal easily: Vitamin C deficiency can lead to the formation of collagen fibers, thus causing wounds do not heal easily. 5. Generalized weakness, irritability: long-term vitamin C deficiency can cause scurvy, manifested as general weakness, lethargy, poor appetite, indigestion, irritability, irritability and other symptoms. Symptoms alone can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment. If the above symptoms occur, it is recommended to consult a doctor in time to clarify the cause of the disease under the guidance of the doctor.