Do bleeding gums and black stools have anything in common?

Agree w Dr Hemming. Both can be related to bleeding problems. Recommend medical assessment.
Yes. Black stools are commonly a result of GI blood loss. If you are swallowing a lot of blood from bleeding gums then black stools are possible. However you need to be evaluated for other causes or black stools as well.

Related Questions

For 5 days my 3 year old son has had fever, swollen and bleeding gums, a white spot inside his lips. Had blood in stools 3 times in the past 4 months.

Need evaluationS. Please call both your dentist and your pcp for immediate examination appointments. Bloody stool is worrisome and should be evaluated immediately. Read more...
Swollen,bleeding gum. Your son has a virus of the mouth in the form of canker sores. Blood in the stool is unrelated and may be due an anal fissure. In any case he should be seen by his pediatrician. Read more...
He needs to see. A pediatrician and a GI asap for a thorough exam and work up.God bless u! http://www.Patient.Co.Uk/doctor/rectal-bleeding-in-children.Htm. Read more...