- Hematuria: Blood in the urine, which can be a sign of a kidney stone or other urinary problem. Gross hematuria is blood that is visible to the naked eye. Microscopic hematuria cannot be seen but is detected on a urine test.
- Histamine: A hormone transmitter involved in local immune response regulating stomach acid production and in allergic reactions.
- Hormone: A natural chemical produced in one part of the body and released into the blood to trigger or regulate particular functions of the body. Antidiuretic hormone tells the kidneys to slow down urine production.
- Hydrocele: A painless swelling of the scrotum caused by collection of fluid around the testicle.