In other words, the. compressor elevates the boiling. point of the refrigerant to a point. at which the air (or water) mov-. ing across the condenser is low. enough to condense the refriger-. ant to a liquid. Additional passes.
The most common cause is a herniated disk: When a disk develops a tear or crack and bulges into the spinal canal, it can pinch the sciatic nerve. Usually symptoms clear up within about 6 weeks, but for some people, the pain can last.
The rash forms over a period of three to five days and is often uncomfortable. A person's pain is variable, ranging from very mild to severe. Eventually, the vesicles crust over and then heal within two to four weeks. The pain from shingles can last for weeks, months, or even years after an outbreak.