Addressing Vitamin Deficiency for a Healthier Future. The most common vitamin deficiencies include vitamins D, B12, A, and C. These deficiencies can lead to various health issues if not addressed. Vitamin D deficiency symptoms include bone pain, muscle weakness, increased risk of fractures, and fatigue. Vitamin B12 deficiency can cause anemia, fatigue, weakness, constipation, loss of appetite, and neurological issues. Vitamin A deficiency can lead to night blindness, dry skin, and a higher risk of infections. Vitamin C deficiency includes frequent infections, fatigue, swollen gums, joint pain, and slow wound healing. Causes of deficiency include poor diet, Crohn's disease, smoking, or excessive alcohol consumption. Regular check-ups can help identify deficiencies early, especially in the elderly, pregnant women, and those with chronic illnesses. A balanced diet rich in fruits, vegetables, whole grains, and lean proteins can prevent deficiencies. Take charge of your health today by understanding and addressing vitamin deficiencies.