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.
Some of the biggest vitamin D deficiency symptoms include: 1  Weakened immune system. 2  Seasonal depression. 3  Autoimmune disease. 4  Cancer. 5  Weak bones (osteopenia) 6  Skin issues eczema and psoriasis. 7  Dementia.