What are the signs of vitamin C deficiency?

Severe deficiency causes scurvy. Its signs can appear within 1 month on less than about 10 mg a day.^[1] First come tiredness and inflamed gums; later come small bleeds under the skin, bruises, joint pain, slow wound healing, bleeding gums and loose teeth.^[1] Scurvy is rare in developed countries. People who smoke, eat few kinds of food or absorb nutrients poorly are more likely to get too little vitamin C.^[1]