28/09/2025
Symptoms of B Vitamin Deficiencies
🧾 Introduction B vitamins are among the most important vitamins for energy and brain, nerve and skin health. Deficiency in any one causes clear symptoms through which the body can alert us.
🔹 Vitamin B1 (thiamine)
- Sores and cracked mouth corners 👉 due to weakened mucous membranes.
- Loss of appetite and weight 👉 from disrupted food metabolism.
- Confusion and memory problems 👉 thiamine is essential for brain function.
- Heart problems 👉 such as an enlarged or weakened heart muscle.
🔹 Vitamin B2 (riboflavin)
- Cracked lips and swelling of the mouth 👉 prominent deficiency signs.
- Red, itchy eyes 👉 because it affects mucous membranes.
- Hair loss 👉 because of its relationship with hair follicle health.
- Numbness in the hands and feet 👉 because of its effect on nerves.
- Risk to fetuses 👉 severe deficiency may cause birth defects.
🔹 Vitamin B3 (niacin)
- Fatigue and headache 👉 because it participates in energy production.
- Loss of appetite and insomnia 👉 due to nervous system weakness.
- Depression or hallucinations 👉 severe deficiency may cause psychological disorders.
- Rough skin patches 👉 due to impaired skin renewal.
- A bright red tongue 👉 a characteristic sign of deficiency.
🔹 Vitamin B5 (pantothenic acid)
- Burning in hands and feet 👉 due to nerve dysfunction.
- Persistent exhaustion 👉 because it is important for energy production.
🔹 Vitamin B6 (pyridoxine)
- Weak, brittle hair 👉 because it participates in protein formation.
- Brittle nails 👉 a sign of impaired metabolism.
- Anemia 👉 because of its role in hemoglobin formation.
- Swollen tongue and rash 👉 especially around the mouth and eyes.
- Depression and weak immunity 👉 because it is essential for neurotransmitter production.
🔹 Vitamin B7 (biotin)
- Hair loss and weakness 👉 the most common symptom.
- Brittle nails 👉 deficiency weakens their structure.
- Skin problems (rash or itching) 👉 due to impaired skin health.
🔹 Vitamin B9 (folic acid)
- Anemia and exhaustion 👉 because it is essential for red blood cell formation.
- Loss of appetite and headache 👉 early symptoms.
- Difficulty concentrating and balancing 👉 due to effects on the brain.
- Palpitations and breathlessness 👉 due to anemia.
- Mouth sores and confusion 👉 additional deficiency signs.
🔹 Vitamin B12 (cobalamin)
- General weakness or severe fatigue 👉 among the most common symptoms.
- Constipation or digestive problems 👉 because of its role in digestion.
- Tingling or numbness in the extremities 👉 because it is important for nerve health.
- Difficulty concentrating and memory problems 👉 characteristic deficiency signs.
- Palpitations or breathlessness 👉 due to anemia.
💡 Medical advice from AlFarabi Medical Labs: Symptoms of B vitamin deficiencies sometimes overlap, so correct diagnosis requires accurate tests. At AlFarabi Medical Labs you can have a comprehensive B vitamin assessment and check your levels.
A test result is not a diagnosis. Show it to your doctor.



