Burning during urination could be due a urinary tract infection
which is the infection
of the urinary
system consisting of kidneys, ureters, bladder, prostate (in men), urethra.
It is caused by a pathogen, typically bacteria which can cause infection along the urinary tract.
Diagnosis is usually by clinical features, microscopic examination or by culture of the urine.
Treatment is by antibiotics which can eradicate the causative pathogen.