why is my hair changing???

old are you now? Many medications can either take out or put in curl....anesthethesia can too.....

A lot of it has to do with the length and thickness of your hair. When my hair is long (past my shoulders) it is mostly straight as a board. But, when I have it cut short, it drives me crazy because it is so wavy and curly in all the wrong places.

When I was younger, if I wanted my longer hair to have some wave in it, I had to have it thinned to remove some of the weight of the hair so it would relax and curl. Now that I'm older and my hair is thinning naturally, I just keep it short and let it do what it wants to do.

im in my teens and take no medication, it has happened completely naturally

I think, its depend upon weather or your age.

When I was young, I had extremely curly hair, but when my hair suddenly turned straight after having an appendectomy I wondered why hair texture changes.

I think you are changing your hair products regular; its affect your hair.

my hair curly underneath and straight on top...

It depend upon your age and the products you are using for the hairs.

I am afraid it has something to do with your shampoo, I am not so sure.

Health/diet, hormonal imbalance, medication, chemical treatment and other stuff can affect the hair texture. So, it is highly recommended that - you consult your personal beauty wellness consultant or a dermatologist for hair evaluation/diagnosis. That would help.

Sure. Doesn't everybody have a personal beauty wellness consultant on retainer?

best post of thread.

Use natural Oil and shampoo. hope it will help you.

There are a variety of factors can actually change both the colour and texture of strands through the years.
1.Stress
2. Hot Heat
3.Chemical Treatments
4.Genetics and Aging
5. Medical Conditions and Illness
6.Pregnancy