Since the grinding process is done by tea makers nowadays, although it used to be done at home in the past, Tencha itself is not well-known even among Japanese.
Instead, listening the word “Tencha”, more Japanese will remember Chinese sweet tea, which is also called Tencha in Japanese. (The characters of Tencha for Matcha and for Chinese sweet tea are different, though.) The Chinese Tencha is known to have a polyphenol, which works as anti-allergy.
Suffering from hay fever, lots of Japanese attract Chinese Tencha in hopes that it might help alleviate a grave symptom.
When spring is coming, many Japanese are excited to see cherry blossoms, but at the same time, we have to overcome a lot of cedar pollen. Unfortunately, I am one of them. Too bad.....