Noun. 1. dark matter - (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force.
Causes of Similar Symptoms to Acute prostate blockage like symptoms. Research the causes of these symptoms that are similar to, or related to, the symptom Acute prostate blockage like symptoms: Introduction.  conditions which cause acute symptoms similar to that when there is a blockage to prostate secretions. See detailed information below for a list of 1 causes of Acute prostate blockage like symptoms, including diseases and drug side effect causes. Â» Review Causes of  Causes.
The urethra may be blocked by a urinary stone, an accumulation of microscopic crystals and mucus that forms a plug, blood clots, or a tumor. Sometimes the urinary blockage is not mechanical, but is either due to muscle spasms along the urethra, or a nerve problem that causes the cat to be unable to urinate.