Thin hair. What could be done to thicken my hair?

You cannot thicken your hair with surgery if you were born with fine hair.  If you are considering a cosmetic surgery it is best to see a doctor for a consultation.

Thin hair is not necessarily a cause of concern, unless you've seen a dramatic change in the past couple of months, its likely genetic. There are hair care products that can help layer the strand with proteins like silk protein, and thicken the hair that way. Laser and PRP treatments can also help reduce hair loss but won't necessarily help with the thickness. Nutraceuticals such as Nutrafol have marine collagen and other hair benefiting building blocks so taking a supplement like that may do the trick for you.

First of all, you should see a qualified hair expert to determine if the reason for your thin hair is medical, or genetic. Once that is established, for female patients, taking iron is important as low iron can cause thinning and hair loss in women. Also, the addition of minoxidil can help to thicken the hair. Recently, the use of platelet rich plasma injections may also help. 

By thin hair if you mean fine hair, no you can not thicken it with hair transplant. There are however, good products that thicken hair which you can purchase in the pharmacies. These products can double the thickness if each hair on your head