Vitamin Deficiency Symptoms Every vitamin plays a key role in your eyes, skin, immunity, nerves, muscles & overall health. Deficiency of Vitamin A, B, C, D, E can cause serious health issues if ignored. ✔ Vitamin A → Night blindness ✔ B1 → Weak muscles / Beri-beri ✔ B2 → Sore throat, skin disorders ✔ B3 → Pellagra (Dermatitis) ✔ B5 → Muscle cramps ✔ B6 → Anaemia, mood issues ✔ B7 → Hair loss, skin rashes ✔ B9 → Neural tube defects ✔ B12 → Anaemia & nerve problems ✔ Vitamin C → Scurvy, bleeding g