“Water in the fallopian tubes” (hydrosalpinx) is the final stage of a fallopian tube pus infection. The tube closes its ampular area during the infection in order to prevent the infection from spreading the infection up to the peritoneal cavity. The infection agents are usually purulent microbes such as Staphylococcus, Streptococcus or Gonorrhea. Pus collects in the tube’s lumen (pyosalpinx). After some time, the pus turns into a serous liquid (hydrosalpinx). There is always a risk for repeating the infection so surgical removal of the tubes is recommended.