Hi Suzan, that's a big question. The answer had to be very long in order to address it properly. I just recently released an entire course called "Thai Massage For Sciatica" which deals with this in great depth during several hours of training. To my knowledge this is the only online Thai Massage training course which deals with sciatica in detail. There are several threads here in the forum of students who have had good success with their clients after they took this training. You can search the forum to find the threads.

I wish it would be so simple that I could give you a helpful answer right here, but it is too complex for that. All I can say is that it is possible to be very effective with sciatica using Thai Massage techniques.

Regarding scoliosis, I have to give you a similar answer. It requires a comprehensive Thai Massage workout which I call the "7ways to move the spine". This is also quite a lengthy subject, and it is described in great detail in my "Thai Back Massage" course.

I don't want to make this sound like a sales commercial, but it is just not possible to give you a short answer to your question which would be of any use. 

The bottom line is that Thai Massage can be very effective for both scoliosis and sciatica if you have specific training which goes way beyond basic Thai Massage. This is what Thai Healing Massage Academy is all about.

I know you enrolled in the Complete Thai Massage course. This will enable you to be an excellent Thai Massage therapist. However Thai Massage is a huge subject, and it is not possible to put all details about all the specific therapy applications into one course. You can keep on learning Thai Massage for years, and if you really want to become very good at it, that's what it takes. 

So my approach has been to provide a very comprehensive training program to learn Thai Massage, and that's what you have. However if you really want to specialize in therapeutic applications (which not every therapist is interested or willing to do), then we provide many  highly specific training courses that address many areas of the body and specific conditions.

Your question about sciatica is one of those really specialized applications. Yes there are things that you should avoid, but first you have to understand what exactly sciatica is, what causes it, what to look for, how to find the cause, and how to deal with it. And the only way to find this out is by studying it as a specialty. Just the sciatica course alone is 4 hours of training.

Regarding pregnancy, that's an easier one. This is mostly a common sense issue. However I did write an article about it, and you can read it here:
Are Thai Massage And Pregnancy Compatible?

When you read the article about pregnancy you will find out that the best position to work on pregnant women with Thai Massage is the side position with pillow support.