When sick (cold/flu) or stuffy, is it normal to have some chunky bits with blood when you blow your nose? as long as it doesn't keep bleeding (no nosebleed), is there no bleeding issue (ie. too thin)?

Cold. bloody pieces: When you have a cold the nasal mucosa gets inflammed, friable and increases discharge (also ironically dries out ), so some blood is not uncommon. Try vasoline inside tip of nose AM, PM to mositurize, Vit C ( orange juice 3-4 glasses a day decreasing to 1 glass a day over a week will help . Zyrtec mayhep, less blowing. Fish oil is a anti-coagulant. f/u with doc

Inflamed sinus: A viral infection can affect your sinus/nasal passage and cause it to become very swollen or inflamed. If you combine that with the dry air we often encounter during the winter time (especially if our home heating system is high), then you can develop cracks in the passages - often causing a nosebleed. Saline nasal sprays, or vaseline on a Q-tip can help. Best wishes.