What is Mean by Spasm of Ureter

WHAT IS MEAN BY SPASM OF URETER :

Pregnant females are occasionally subject to accessions of severe pain in the course of the ureters, leading up to the kidneys, and this Churchill says, Dr. Burns attributes to spasm of the ureters, 

Spasm of Ureter is

probably owing to pressure upon these canals as they pass into the cavity of the hips ; 

the attack consists of severe and sometimes

•  intermitting pain, 
• Avith distressing strangury,
•  which may cause abortion if not relieved. 

Change of position will sometimes relieve the pain by removing the pressure ; 

If Cannabis, Pulsat. or Cantharides do not afford relief, Opium should be resorted to, as it is not only anodyne, 
but also homoeopathic to irritation of the bladder and ureters, and to difficulty or retention of urine. Camphor is a useful palliative.

 These attacks may be mistaken for colic, and for congestion or irritation of the ovaries.