Cystitis is usually caused when bacteria enters the urethra or bladder and causes inflammation and infection. It is very common condition and more often occurs in females because their urethra is shorter and closer to the anus. The symptoms of cystitis include constant feeling of wanting to urinate, even though you might not have any urine to pass. Burning in urethra at the time of urination. Urine cloudy or sometimes have blood in it. Dragging ache in the lower back or abdomen. Other symptoms includes repulsive odour of urine, irritation at neck of bladder, offensive discharges, mucous and pus in the urine, sore eructation and taste.