Spitting of blood while brushing teeth, should i be concerned?

Bleeding gums: Bleeding means that there is bacteria present. That bacteria can accumulate and cuse an actual infection in the gum tissue. Over time, if not cleaned properly, that infection can start to melt the bone underneath(periodontitis). See a dentist asap.

Yes: The most frequent cause is inflamed gums because of poor hygiene. If your teeth are clean, then there could be a systemic problem. See your dentist first..

Yes!: At least you have inflamed gums which is a sign of periodontal disease. Periodontal disease may affect seriously your general health. Se your dentist or periodontist.