Thank you for the query.
Yes, it can be urgent condition. The most neglecting symptom is tarry like stool which usually indicates bleeding from upper digestive tract (usually from peptic ulcer
). You should definitely go to ER and have at least hemoglobin level checked. Upper GI endoscopy should be also done.
problem needs to be diagnosed as well. Usually the reason of constipation is bad diet (low fiber products, low mineral water intake), severe bacterial infection, medicines (antidepressants, Ca-blockers), thyroid disease
or large intestine disease. If you are around 50, colon cancer
should be the first ruled out condition.
You should visit your doctor, have rectal examination
and get scheduled for colonoscopy.
Hope this will help.