Why were Noahs curse symptoms fewer compared to Rachel and Aidan?
While Rachel and Aidan experienced visions, burns, nosebleeds, and (in Rachel’s case) even dreamt of coughing up medical equipment, Noah appeared to have gotten off with merely a nosebleed. The reason for this is that either the additional phenomena happened offscreen, Rachel and Aidan — the two people shown to experience more pronounced symptoms than Noah, et. al — also had the greatest “connection” to Samara. After all, it was Rachel that would free Samara from the well, while Aidan possessed psychic abilities that allowed him to “key into” Samara’s presence. Thus, the additional symptoms are perhaps an indicator of getting closer to the power that is Samara, in much the same way that people who approached her in life would become bombarded with horrific images.