Why gums bleed for no reason

Gingival bleeding for no reason, mainly for the following reasons. First may be gingivitis or periodontitis, if ruled out gingivitis or periodontitis, it is suspected whether it is a blood system-related disease. If gingivitis, only dental cleaning treatment can be recovered. If periodontitis, in addition to dental cleaning, but also scaling and root surface leveling, that is, periodontal systemic treatment. And need regular maintenance, every six months or a year for related review and necessary examination. If ruled out gingivitis, also ruled out periodontitis. Is the gum spontaneous bleeding, it is necessary to check the blood system-related diseases, ruled out whether it is due to blood disease caused by spontaneous bleeding gums.