|Manga Debut||Chapter 5|
The Byakugan seems to be available to its users from the time of their birth and does not need to be awakened through any means. Those who possess the Byakugan have very distinctive eyes: when the Byakugan is not active, they have enlarged and featureless white irides with no visible pupils; when the Byakugan is active, the pupils become more distinct and the veins near their temples bulge.
The Byakugan gives the user a near 360º field of vision. Its vision can penetrate through most solid objects and obstructions.
According to the Naruto series, arguably its greatest ability is to see chakra to a greater degree than the Sharingan. The Byakugan's ability to see chakra is so acute that it can actually see the chakra pathway system and the 361 tenketsu that run along it. The Hyūga have devised a style of combat known as the Gentle Fist that specifically takes advantage of this, wherein they strike an opponent's tenketsu to either seal or forcibly open these tenketsu, thus giving the user complete control over their opponent's chakra.