I can't tell you how often i have heard sisters ask if hijab makes hair fall out....First, one should ask why would Allah make us wear something that creates negative effects such as hairloss? Secondly it is no coincidence that a lot of sisters who wear hijab tie their hair in a ponitail underneath the hijab which has been a cause for hairloss! If you ask a hairdresser she will tell you to switch from elastic bands to hair clips to prevent hairloss. I myself noticed some hairloss when i was wearing hijab and realized that it wasnt the hijab that caused my hair to fall out but the elastic bands and how tight i was tying my hair. I have copied an excellent article about facts every sister should know about this issue.
"Many Muslim women and many converts to Islam in particular claim to experience hair loss after adopting hijab (Islamic dress). Their normal reaction is to assume that hijab is the reason for this difficult condition and wonder how they may avoid losing their hair and still wear hijab
Fortunately, it is unlikely that hijab is the cause for any woman to lose her hair. In fact, hijab is a great protection for your hair as it never gets exposed to outside elements such as the sun, wind, air, rain, smog and other forms of pollution. In addition, women who wear hijab are much less likely to use excessive amounts of hairspray or to curl their hair regularly, both of which damage the hair and may cause it to break and fall out.
If you began losing your hair after you adopted hijab, it is most likely a coincidence since there are many health conditions which can contribute to hair-loss in women. For example, it is common to lose large amounts of hair after giving birth, especially if you are breastfeeding. This usually begins 4-6 months after the birth of a baby and grows back soon after that. Illnesses such as thyroid diorders and iron-deficiency anemia may also cause hair to thin and fall out while certain types of medications and even stress can do the same. Whether the hair loss is permanant or temporary depends on many factors, and these are best discussed with a qualified physician.
Older women in particular should realize that hair thinning is a natural part of the aging process although the process is gradual and should not result in large clumps of hair falling out all at once.
To reduce stress on the hair and scalp, do not style your hair in tight braids. Allow your hair to air dry after shampooing and do not brush it while it is wet. Avoid hot curlers and harsh chemicals such as dyes, perms and styling products. In addition, do not make it a habit to leave your hair wet under the hijab."
The Islamic Garden