Urine smell heavy urine is very stinky, consider with insufficient drinking water, purulent pyelonephritis, urethritis, cystitis and other diseases, need to go to the hospital for further examination to clarify the cause of the disease, and then timely consultation. 1. Insufficient water intake: usually due to insufficient water intake or sweating, resulting in an extreme reduction of water in the body, causing the concentration of urine, which in turn leads to the phenomenon of heavy urine odor and foul-smelling urine. 2. Purulent pyelonephritis: usually due to purulent pyelonephritis, resulting in increased protein in the urine, and after decomposition to produce more ammonia, thus causing the phenomenon of heavy urine odor. 3. Urethritis: it may be due to the mucous membrane of the urethra is stimulated by inflammatory mediators, so that the urethral secretion increases, thus causing the phenomenon of heavy urine odor. Urethritis will generally appear frequent urination, hematuria and other symptoms. 4. cystitis: usually due to bladder inflammation will stimulate the bladder triangle and bladder neck, resulting in mucosal edema, erosion, and then the phenomenon of heavy urine odor. The above phenomenon may also be caused by other factors, it is recommended that patients go to the regular hospital in a timely manner to seek treatment, and strive for early recovery.