Can I wear hair extensions as a Muslim woman?

No, according to most scholars. The Prophet ﷺ cursed women who add hair to their own hair, and this includes human hair extensions and wigs. Many scholars include synthetic hair that looks real. Some allow attaching non-hair materials like wool or colored thread to tie the hair, and normal hair accessories are fine.
The hadith
Aisha reported that a young Ansari woman got married, then fell ill and lost her hair. Her family wanted to add false hair. The Prophet ﷺ said that Allah has cursed the woman who adds hair and the one who asks for it to be added (Sahih al-Bukhari 5934). Asma reported a very similar case: a mother asked about a bride who had lost her hair through illness, and the Prophet still refused (Sahih Muslim 2122). That even a sick bride wasn't allowed shows how serious this is.
What's included
- Human hair extensions: forbidden by agreement.
- Synthetic extensions, weaves and clip-ins that look like hair: most scholars say forbidden, because they have the same effect.
- Wool, thread or ribbons tied into the hair that don't look like hair: some scholars, including Hanafi and some Hanbali scholars, allow these.
- Scrunchies, clips, hairbands: fine.
Scholars explain the wisdom as avoiding deception and changing Allah's creation for show. The same idea appears in the hadith about tattoos and plucking (Sahih al-Bukhari 5939).
Alternatives
- Hair care: oils, treatments and healthy diet to grow your own hair.
- Hairstyles, braids and cuts that make thin hair look fuller.
- Dyeing your hair, which is allowed with conditions. See Can I dye my hair?
- For hair loss from illness, see a doctor about treatment.
If you already have them
If you got extensions before Islam or before knowing the ruling, there's no sin for what you didn't know. Remove them when you reasonably can. Allah forgives what came before (Quran 39:53). See Can I wear a wig instead of a hijab?
- Adding hair to hair is forbidden.
- Most scholars include synthetic hair.
- Wool or thread ties are allowed by some.
- No sin for past extensions you didn't know about.
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A small bun to hold your scarf is fine. The Prophet warned about heads like camel humps, which scholars link to large, showy buns.
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