looked around first, still need help...

hi today i am just wondering what is going on with my plant? it is slowly turning yellow from the bottom up. my plant is flowering and would hate for something to get messed up now. i was wondering if it was nute burn or something or if its anything different. thanks.

Could be lack of nutrients, but I've also seen plants kill off leaves and branches that don't receive much light to focus on bigger better things.

Imo I would flush it out with water at a 6.0 ph then give it a 1/4 strength dose of It's veg nutes with a drop of a b1 supplement. Put it in the shade or under flouros for a few days or until you see improvements. See if that helps.