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A deficiency disease is one caused by a lack of something we need. Some examples are:

  1. scurvy, caused by insufficient vitamin C. Symptoms include bleeding gums and failure to heal.
  2. rickets, caused by lack of calcium or vitamin D. Symptoms are weak, soft bones and stunted growth.
  3. Pellagra, caused by lack of vitamin B3, niacin. Symptoms include inflamed skin, diarrhea, dementia, and sores in the mouth.
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Q: What are deficiency diseases Name three deficiency diseases and also write their causes and symptoms?
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