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. Prp is a wonderful new firm of therapy with promising results. Its safe and helps in thickening of hair. See a dermatologist near you to get evaluated. Hope this helps. Further queries may be sent on follow up  messaging. Warm regards. Dr Govind Suresh Mittal, Bangalore.