Serpent (symbolism) The serpent, or snake, is one of the oldest and most widespread mythological symbols. The word is derived from Latin serpens, a crawling animal or snake. Snakes have been associated with some of the oldest rituals known to humankind and represent dual expression of good and evil.
1 Osteoporosis, a condition characterized by reduced bone mineral density and increased bone fragility.  Rickets, a childhood disease characterized by impeded growth and deformity of the long bones. The earliest sign of subclinical vitamin D deficiency is craniotabes, abnormal softening or thinning of the skull.
The symptoms of vitamin D deficiency are sometimes vague and can include tiredness and general aches and pains. Some people may not have any symptoms at all. If you have a severe vitamin D deficiency you may have pain in your bones and weakness, which may mean you have difficulty getting around.or a number of reasons, many people arenât getting enough vitamin D to stay healthy. This is called vitamin D deficiency. You may not get enough vitamin D if: 1  You donât get enough sunlight. 2  Your body is usually able to get all the vitamin D it needs if you regularly expose enough bare skin to the sun.