Hi. Greetings. In women, Anaemia, hormonal issues, environmental factors , pollution, stress, junk food and poor diet could cause you to lose hair. After adequate evaluation by dermatologist, You'll probably need treatment with hair care lotions or serums - something that has vasodilator properties and improves thickness of hair and reduces hair loss. Have a good balanced nutritious diet.For Vit b12 deficiency you'll need a specific schedule of injection replacement. See a dermatologist near you to get evaluated if you have any other scalp problem. Hope this helps. Let me know if you need any further assistance in this regard. Warm regards.