Question

A disease whose primary symptom is blood in the urine​

Answer 1

Urinary tract or kidney infections.
Bladder or kidney stones. Certain kidney diseases, such as inflammation in the filtering system (glomerulonephritis)

Answer 2

Urinary tract infections.

For some people, especially older adults, the only sign of illness might be microscopic blood in the urine. Kidney infections (pyelonephritis). These can occur when bacteria enter your kidneys from your bloodstream or move from your ureters to your kidney(s)