For 2 days i have had dried blood in nose & i clear throat a few streaks of blood in mucus spit out. clear chst x-ray 3 mth ago. causes? lung cancer?

Nose bleed: The bleeding you are describing seems to be coming from the nose. This can be either because your nose is dry or you may have a sinus problem. Start by using a saline nasal spray 2 to 3 times a day and see if your condition improves. If not, see an otolaryngologist or allergist.

Probably not: The most common cause of blood in the nose and after clearing your throat would be a nose bleed. Lung cancer is exceedingly rare in 29 year olds, and this would not be a common way for it to present.